chore: release google-auth-library-ruby 0.16.2

[yoshi-code-bot]

:robot: I have created a release *beep* *boop*

0.16.2 (2021-04-28)

Bug Fixes

• Stop attempting to get the project from gcloud when applying self-signed JWTs (#317) (39258ca)

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[yoshi-automation]

Release is at https://github.com/googleapis/google-auth-library-ruby/releases/tag/google-auth-library-ruby/v0.16.2

[release-tool-publish-reporter[bot]]

The release build has started, the log can be viewed here. :sunflower:

[release-tool-publish-reporter[bot]]

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