contracts-bedrock: fix the solc version for Types

This standardizes the solidity pragma to be `^0.8.0` for
`Types`. All of the other libraries are set to this version,
and it makes the code more portable for projects that want
to import it. It will have no impact on the deployed bytecode.

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

 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.9;
+pragma solidity ^0.8.0;
 
 /**
  * @title Types