Bump google-auth-httplib2 from 0.1.1 to 0.2.0 (#72)

Bumps [google-auth-httplib2](https://github.com/GoogleCloudPlatform/google-auth-library-python-httplib2) from 0.1.1 to 0.2.0.
- [Release notes](https://github.com/GoogleCloudPlatform/google-auth-library-python-httplib2/releases)
- [Changelog](https://github.com/googleapis/google-auth-library-python-httplib2/blob/main/CHANGELOG.md)
- [Commits](googleapis/google-auth-library-python-httplib2@v0.1.1...v0.2.0)

---
updated-dependencies:
- dependency-name: google-auth-httplib2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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requirements.txt

@@ -2,5 +2,5 @@ fastapi==0.108.0
 uvicorn==0.25.0
 starlette-prometheus==0.9.0
 google-api-python-client==2.113.0
-google-auth-httplib2==0.1.1
+google-auth-httplib2==0.2.0
 google-auth-oauthlib==1.2.0