Upgrade @metamask/wallet to version 5.0.0

A new major version of `@metamask/wallet`, 5.0.0, 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.

Locate the project's reference to @metamask/wallet and confirm whether the package is used. If present, update it to version 5.0.0 and run the existing extension checks; done means the dependency is upgraded without breaking the project and the new version unblocks its features and bugfixes.

Written by the indexing model from the issue text.