feat(ctb): Add L1ERC721Bridge admin deploy check

packages/contracts-bedrock/contracts/deployment/SystemDictator.sol

@@ -419,7 +419,7 @@ contract SystemDictator is OwnableUpgradeable {
     }
 
     /**
-     * @notice Calls the next remaings steps of the migration process.
+     * @notice Calls the remaining steps of the migration process.
      */
     function phase2() external onlyOwner {
         step3();

packages/contracts-bedrock/deploy/021-SystemDictatorSteps-2.ts

@@ -33,6 +33,7 @@ const deployFn: DeployFunction = async (hre) => {
     L2OutputOracle,
     OptimismPortal,
     OptimismMintableERC20Factory,
+    L1ERC721BridgeProxy,
     L1ERC721Bridge,
   ] = await getContractsFromArtifacts(hre, [
     {
@@ -76,6 +77,9 @@ const deployFn: DeployFunction = async (hre) => {
       iface: 'OptimismMintableERC20Factory',
       signerOrProvider: deployer,
     },
+    {
+      name: 'L1ERC721BridgeProxy',
+    },
     {
       name: 'L1ERC721BridgeProxy',
       iface: 'L1ERC721Bridge',
@@ -222,6 +226,12 @@ const deployFn: DeployFunction = async (hre) => {
         })) === ProxyAdmin.address
       )
 
+      assert(
+        (await L1ERC721BridgeProxy.callStatic.admin({
+          from: ProxyAdmin.address,
+        })) === ProxyAdmin.address
+      )
+
       // Step 5 checks
       // Check L2OutputOracle was initialized properly.
       await assertContractVariable(