contracts-bedrock: pin to solidity 0.8.15

packages/contracts-bedrock/contracts/L1/L1CrossDomainMessenger.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Predeploys } from "../libraries/Predeploys.sol";
 import { OptimismPortal } from "./OptimismPortal.sol";

packages/contracts-bedrock/contracts/L1/L1StandardBridge.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Predeploys } from "../libraries/Predeploys.sol";
 import { StandardBridge } from "../universal/StandardBridge.sol";

packages/contracts-bedrock/contracts/L1/L2OutputOracle.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import {
     OwnableUpgradeable

packages/contracts-bedrock/contracts/L1/OptimismPortal.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
 import { ExcessivelySafeCall } from "excessively-safe-call/src/ExcessivelySafeCall.sol";

packages/contracts-bedrock/contracts/L1/ResourceMetering.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
 import { Math } from "@openzeppelin/contracts/utils/math/Math.sol";

packages/contracts-bedrock/contracts/L2/GasPriceOracle.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Semver } from "../universal/Semver.sol";
 import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

packages/contracts-bedrock/contracts/L2/L1Block.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Semver } from "../universal/Semver.sol";
 

packages/contracts-bedrock/contracts/L2/L2CrossDomainMessenger.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { AddressAliasHelper } from "../vendor/AddressAliasHelper.sol";
 import { Predeploys } from "../libraries/Predeploys.sol";

packages/contracts-bedrock/contracts/L2/L2StandardBridge.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Predeploys } from "../libraries/Predeploys.sol";
 import { StandardBridge } from "../universal/StandardBridge.sol";

packages/contracts-bedrock/contracts/L2/L2ToL1MessagePasser.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Hashing } from "../libraries/Hashing.sol";
 import { Burn } from "../libraries/Burn.sol";

packages/contracts-bedrock/contracts/L2/SequencerFeeVault.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Semver } from "../universal/Semver.sol";
 import { L2StandardBridge } from "./L2StandardBridge.sol";

packages/contracts-bedrock/contracts/legacy/AddressManager.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
 

packages/contracts-bedrock/contracts/legacy/DeployerWhitelist.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Semver } from "../universal/Semver.sol";
 

packages/contracts-bedrock/contracts/legacy/L1BlockNumber.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { L1Block } from "../L2/L1Block.sol";
 import { Predeploys } from "../libraries/Predeploys.sol";

packages/contracts-bedrock/contracts/legacy/L1ChugSplashProxy.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 /**
  * @title IL1ChugSplashDeployer

packages/contracts-bedrock/contracts/legacy/LegacyERC20ETH.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Predeploys } from "../libraries/Predeploys.sol";
 import { OptimismMintableERC20 } from "../universal/OptimismMintableERC20.sol";

packages/contracts-bedrock/contracts/legacy/ResolvedDelegateProxy.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { AddressManager } from "./AddressManager.sol";
 

packages/contracts-bedrock/contracts/libraries/Burn.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 /**
  * @title Burner

packages/contracts-bedrock/contracts/libraries/Bytes.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 /**
  * @title Bytes

packages/contracts-bedrock/contracts/libraries/Encoding.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Hashing } from "./Hashing.sol";
 import { RLPWriter } from "./rlp/RLPWriter.sol";

packages/contracts-bedrock/contracts/libraries/Hashing.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Encoding } from "./Encoding.sol";
 

packages/contracts-bedrock/contracts/libraries/Predeploys.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 /**
  * @title Predeploys

packages/contracts-bedrock/contracts/libraries/rlp/RLPReader.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 /**
  * @custom:attribution https://github.com/hamdiallam/Solidity-RLP

packages/contracts-bedrock/contracts/libraries/rlp/RLPWriter.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 /**
  * @custom:attribution https://github.com/bakaoh/solidity-rlp-encode

packages/contracts-bedrock/contracts/libraries/trie/MerkleTrie.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Bytes } from "../Bytes.sol";
 import { RLPReader } from "../rlp/RLPReader.sol";

packages/contracts-bedrock/contracts/libraries/trie/SecureMerkleTrie.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 /* Library Imports */
 import { MerkleTrie } from "./MerkleTrie.sol";

packages/contracts-bedrock/contracts/test/BenchmarkTest.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 /* Testing utilities */
 import { Test } from "forge-std/Test.sol";

packages/contracts-bedrock/contracts/test/CommonTest.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 /* Testing utilities */
 import { Test } from "forge-std/Test.sol";

packages/contracts-bedrock/contracts/test/DeployerWhitelist.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { CommonTest } from "./CommonTest.t.sol";
 import { DeployerWhitelist } from "../legacy/DeployerWhitelist.sol";

packages/contracts-bedrock/contracts/test/Encoding.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { CommonTest } from "./CommonTest.t.sol";
 import { Encoding } from "../libraries/Encoding.sol";

packages/contracts-bedrock/contracts/test/GasPriceOracle.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { CommonTest } from "./CommonTest.t.sol";
 import { GasPriceOracle } from "../L2/GasPriceOracle.sol";

packages/contracts-bedrock/contracts/test/Hashing.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { CommonTest } from "./CommonTest.t.sol";
 import { Hashing } from "../libraries/Hashing.sol";

packages/contracts-bedrock/contracts/test/L1Block.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { CommonTest } from "./CommonTest.t.sol";
 import { L1Block } from "../L2/L1Block.sol";

packages/contracts-bedrock/contracts/test/L1BlockNumber.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { Test } from "forge-std/Test.sol";
 import { L1Block } from "../L2/L1Block.sol";

packages/contracts-bedrock/contracts/test/L1CrossDomainMessenger.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 /* Testing utilities */
 import { Messenger_Initializer, Reverter, CallerCaller } from "./CommonTest.t.sol";

packages/contracts-bedrock/contracts/test/L1StandardBridge.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { Bridge_Initializer } from "./CommonTest.t.sol";
 import { StandardBridge } from "../universal/StandardBridge.sol";

packages/contracts-bedrock/contracts/test/L2CrossDomainMessenger.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { Messenger_Initializer, Reverter, CallerCaller } from "./CommonTest.t.sol";
 

packages/contracts-bedrock/contracts/test/L2OutputOracle.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { L2OutputOracle_Initializer, NextImpl } from "./CommonTest.t.sol";
 import { L2OutputOracle } from "../L1/L2OutputOracle.sol";

packages/contracts-bedrock/contracts/test/L2StandardBridge.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { Bridge_Initializer } from "./CommonTest.t.sol";
 import { stdStorage, StdStorage } from "forge-std/Test.sol";

packages/contracts-bedrock/contracts/test/L2ToL1MessagePasser.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { CommonTest } from "./CommonTest.t.sol";
 import { L2ToL1MessagePasser } from "../L2/L2ToL1MessagePasser.sol";

packages/contracts-bedrock/contracts/test/LegacyERC20ETH.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { CommonTest } from "./CommonTest.t.sol";
 import { LegacyERC20ETH } from "../legacy/LegacyERC20ETH.sol";

packages/contracts-bedrock/contracts/test/OptimismMintableERC20.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Bridge_Initializer } from "./CommonTest.t.sol";
 import "../universal/SupportedInterfaces.sol";

packages/contracts-bedrock/contracts/test/OptimismMintableERC20Factory.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Bridge_Initializer } from "./CommonTest.t.sol";
 import { LibRLP } from "./RLP.t.sol";

packages/contracts-bedrock/contracts/test/OptimismPortal.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Portal_Initializer, CommonTest, NextImpl } from "./CommonTest.t.sol";
 import { AddressAliasHelper } from "../vendor/AddressAliasHelper.sol";

packages/contracts-bedrock/contracts/test/Proxy.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Test } from "forge-std/Test.sol";
 import { Proxy } from "../universal/Proxy.sol";

packages/contracts-bedrock/contracts/test/ProxyAdmin.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Test } from "forge-std/Test.sol";
 import { Proxy } from "../universal/Proxy.sol";

packages/contracts-bedrock/contracts/test/RLP.t.sol

 // SPDX-License-Identifier: Unlicense
-pragma solidity >=0.8.0;
+pragma solidity ^0.8.0;
 
 import { Bytes32AddressLib } from "@rari-capital/solmate/src/utils/Bytes32AddressLib.sol";
 

packages/contracts-bedrock/contracts/test/RLPReader.t.sol

-// SPDX-License-Identifier: Unlicense
-pragma solidity >=0.8.0;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { RLPReader } from "../libraries/rlp/RLPReader.sol";
 import { CommonTest } from "./CommonTest.t.sol";

packages/contracts-bedrock/contracts/test/RLPWriter.t.sol

-// SPDX-License-Identifier: Unlicense
-pragma solidity >=0.8.0;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { RLPWriter } from "../libraries/rlp/RLPWriter.sol";
 import { CommonTest } from "./CommonTest.t.sol";

packages/contracts-bedrock/contracts/test/ResourceMetering.t.sol

-//SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
 
 import { CommonTest } from "./CommonTest.t.sol";
 import { ResourceMetering } from "../L1/ResourceMetering.sol";

packages/contracts-bedrock/contracts/test/Semver.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { CommonTest } from "./CommonTest.t.sol";
 import { Semver } from "../universal/Semver.sol";

packages/contracts-bedrock/contracts/test/SequencerFeeVault.t.sol

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.15;
+pragma solidity 0.8.15;
 
 import { Bridge_Initializer } from "./CommonTest.t.sol";