ctp: Bump version in drip checks (#3567)

.changeset/spicy-points-invent.md

+---
+'@eth-optimism/contracts-periphery': patch
+---
+
+Increased solc version on drip checks to 0.8.16.

packages/contracts-periphery/contracts/universal/drippie/dripchecks/CheckBalanceHigh.sol

 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.15;
+pragma solidity 0.8.16;
 
 import { IDripCheck } from "../IDripCheck.sol";
 

packages/contracts-periphery/contracts/universal/drippie/dripchecks/CheckBalanceLow.sol

 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.15;
+pragma solidity 0.8.16;
 
 import { IDripCheck } from "../IDripCheck.sol";
 

packages/contracts-periphery/contracts/universal/drippie/dripchecks/CheckGelatoLow.sol

 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.15;
+pragma solidity 0.8.16;
 
 import { IDripCheck } from "../IDripCheck.sol";
 

packages/contracts-periphery/contracts/universal/drippie/dripchecks/CheckTrue.sol

 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.15;
+pragma solidity 0.8.16;
 
 import { IDripCheck } from "../IDripCheck.sol";