Upgrade @metamask/bridge-controller to version 68.0.0

A new major version of `@metamask/bridge-controller`, 68.0.0, 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.

Check the project manifests and lockfiles to determine whether @metamask/bridge-controller is present and where its version is declared. Update it to 68.0.0, then run the repository's relevant validation checks; done means the project uses the requested version without introducing failures.

Written by the indexing model from the issue text.