Official Workaround tip for build failures due to Google-related dependency errors

Hi everyone!

There have been several reports that builds via Unity Cloud Build keep failing due to errors as below:

[Unity] An error occurred while resolving packages:

[Unity] Project has invalid dependencies:

[Unity] com.google.external-dependency-manager: Package [com.google.external-dependency-manager@1.2.159] cannot be found

[Unity] com.google.firebase.analytics: Package [com.google.firebase.analytics@6.15.2] cannot be found

[Unity] com.google.firebase.auth: Package [com.google.firebase.auth@6.15.2] cannot be found

[Unity] com.google.firebase.crashlytics: Package [com.google.firebase.crashlytics@6.15.2] cannot be found

[Unity] com.google.firebase.database: Package [com.google.firebase.database@6.15.2] cannot be found

[Unity] com.google.firebase.dynamic-links: Package [com.google.firebase.dynamic-links@6.15.2] cannot be found

[Unity] com.google.firebase.storage: Package [com.google.firebase.storage@6.15.2] cannot be found

This may be due to the fact that Game Package Registry (GPR) by Google has been shut down on May 19, 2021. To avoid this error going forward, please refer to the Migrating from UPM packages to Asset packages section on this page(linked) and follow the instructions.

Thank you!