Upgrade @metamask/signature-controller to version 37.0.0

A new major version of `@metamask/signature-controller`, 37.0.0, 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 checking the project dependency manifests to confirm whether @metamask/signature-controller is present and identify the current version. Upgrade it to 37.0.0, then run the repository's existing validation checks to confirm the mobile project still builds and tests successfully.

Written by the indexing model from the issue text.