Release 4.21.0

What's Changed

• Fix supported networks update workflow by @louis-md in #646
• docs: fix typo in @safe-global/types-kit by @lumtis in #647
• docs: Add EIP-7702 video to Resource Hub by @tanay1337 in #648
• Add safenet docs secured by @valle-xyz in #654

New Contributors

• @lumtis made their first contribution in #647

Full Changelog: v4.20.0...v4.21.0