build(deps): bump google/auth from 1.42.0 to 1.43.0

Bumps [google/auth](https://github.com/googleapis/google-auth-library-php) from 1.42.0 to 1.43.0.
- [Release notes](https://github.com/googleapis/google-auth-library-php/releases)
- [Changelog](https://github.com/googleapis/google-auth-library-php/blob/main/CHANGELOG.md)
- [Commits](googleapis/google-auth-library-php@v1.42.0...v1.43.0)

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

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