Upgrade @metamask/eth-json-rpc-middleware to version 21.0.0 #21308
Description
A new major version of @metamask/eth-json-rpc-middleware, 21.0.0, is now available. This issue has been assigned to you and your team because you code-own this package in the core repo. If this package is present in this project, please prioritize upgrading it soon to unblock new features and bugfixes.