build(deps): bump google-auth from 1.20.1 to 1.21.0 (#2812)
build(deps): bump google-auth from 1.20.1 to 1.21.0 (#2812)

Bumps [google-auth](https://github.com/googleapis/google-auth-library-python) from 1.20.1 to 1.21.0.
- [Release notes](https://github.com/googleapis/google-auth-library-python/releases)
- [Changelog](https://github.com/googleapis/google-auth-library-python/blob/master/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-auth-library-python/compare/v1.20.1...v1.21.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

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