pip: bump google-auth from 2.49.0 to 2.49.1 (#6126)

Bumps [google-auth](https://github.com/googleapis/google-auth-library-python) from 2.49.0 to 2.49.1.
- [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](https://github.com/googleapis/google-auth-library-python/commits)

---
updated-dependencies:
- dependency-name: google-auth
  dependency-version: 2.49.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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requirements.txt

@@ -18,7 +18,7 @@ google-cloud-ndb==2.4.0
 google-cloud-logging==3.14.0
 google-cloud-secret-manager==2.26.0
 google-cloud-storage==3.9.0
-google-auth==2.49.0
+google-auth==2.49.1
 google-genai==1.67.0
 requests==2.32.5
 redis==6.4.0