chore(deps): bump google-auth-httplib2 from 0.3.1 to 0.4.0 in /backend (#247)

Bumps [google-auth-httplib2](https://github.com/googleapis/google-cloud-python) from 0.3.1 to 0.4.0.
- [Release notes](https://github.com/googleapis/google-cloud-python/releases)
- [Changelog](https://github.com/googleapis/google-cloud-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-cloud-python/compare/google-auth-httplib2-v0.3.1...google-auth-httplib2-v0.4.0)

---
updated-dependencies:
- dependency-name: google-auth-httplib2
  dependency-version: 0.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Christian Krakau-Louis <christianlouis@gmail.com>

backend/requirements.txt

@@ -31,7 +31,7 @@ email-validator==2.3.0
 google-api-python-client==2.193.0
 google-auth==2.52.0
 google-auth-oauthlib==1.3.1
-google-auth-httplib2==0.3.1
+google-auth-httplib2==0.4.0
 
 # Job Queue & Cache
 celery==5.6.3