Upgrade @metamask/signature-controller to version 33.0.0

A new major version of `@metamask/signature-controller`, 33.0.0, 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.

Start by locating the project's dependency declaration for @metamask/signature-controller and check whether the package is present. Upgrade it to version 33.0.0, then verify the mobile project still builds and its relevant checks pass.

Written by the indexing model from the issue text.