message: contracts-bedrock: delete unused import
  In `OptimismMintableERC20.t.sol`, the RLP lib is imported
  and unused. This deletes the import.
diff: pragma solidity 0.8.10;
  import { Bridge_Initializer } from "./CommonTest.t.sol";
  -import { LibRLP } from "./Lib_RLP.t.sol";
  import "../universal/SupportedInterfaces.sol";
  import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
  