Firebase Admin Go SDK v4.21.0

What's Changed

• feat(auth): Add 'VERIFY_AND_CHANGE_EMAIL' linkType for generateEmailActionLink by @utamori in #705
• fix(deps): Bumped golang.org/x/net and golang.org/x/crypto versions by @lahirumaramba in #767
• feat(fcm): Enable fid and deprecate token for Send API by @yvonnep165 in #765
• [chore] Release 4.21.0 by @yvonnep165 in #770

New Contributors

• @utamori made their first contribution in #705
• @yvonnep165 made their first contribution in #765

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