fix(deps): update module firebase.google.com/go/v4 to v4.21.0

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This PR contains the following updates:

Package	Change	Age	Confidence
firebase.google.com/go/v4	v4.20.0 → v4.21.0

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Release Notes

firebase/firebase-admin-go (firebase.google.com/go/v4)

v4.21.0: Firebase Admin Go SDK v4.21.0

Compare Source

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: firebase/firebase-admin-go@v4.20.0...v4.21.0

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