Build: Bump google-auth from 2.41.1 to 2.42.1

Bumps [google-auth](https://github.com/googleapis/google-auth-library-python) from 2.41.1 to 2.42.1.
- [Release notes](https://github.com/googleapis/google-auth-library-python/releases)
- [Changelog](https://github.com/googleapis/google-auth-library-python/blob/main/CHANGELOG.md)
- [Commits](googleapis/google-auth-library-python@v2.41.1...v2.42.1)

---
updated-dependencies:
- dependency-name: google-auth
  dependency-version: 2.42.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]