Bump googleauth from 0.15.1 to 0.16.0 (#1118)
Bump googleauth from 0.15.1 to 0.16.0 (#1118)

Bumps [googleauth](https://github.com/googleapis/google-auth-library-ruby) from 0.15.1 to 0.16.0.
- [Release notes](https://github.com/googleapis/google-auth-library-ruby/releases)
- [Changelog](https://github.com/googleapis/google-auth-library-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-auth-library-ruby/compare/google-auth-library-ruby/v0.15.1...google-auth-library-ruby/v0.16.0)

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Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
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