Update module firebase.google.com/go/v4 to v4.3.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
firebase.google.com/go/v4	require	minor	v4.2.0 -> v4.3.0

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Release Notes

firebase/firebase-admin-go

v4.3.0

Compare Source

New Features

• feat(auth): GetUserByProviderID() (#​339)
• feat(auth): Add ability to link a federated id with the UpdateUser() method. (#​344)

Miscellaneous

• [chore] Release 4.3.0 (#​424)

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