message: contracts-bedrock: update delete dead imports
diff: pragma solidity 0.8.15;
  import { Semver } from "../universal/Semver.sol";
  -import { L2StandardBridge } from "./L2StandardBridge.sol";
  -import { Predeploys } from "../libraries/Predeploys.sol";
  import { FeeVault } from "../universal/FeeVault.sol";
  /**
  