Upgrade @metamask/signature-controller to version 36.0.0

A new major version of `@metamask/signature-controller`, 36.0.0, 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 dependency declaration for @metamask/signature-controller in the MetaMask mobile project and inspect the package metadata before changing its version to 36.0.0. Confirm the package is present, then run the project's relevant dependency checks or test suite to verify the upgrade is complete.

Written by the indexing model from the issue text.