Bump google-api-python-client in /docker/googleapi-python3

Bumps [google-api-python-client](https://github.com/googleapis/google-api-python-client) from 2.155.0 to 2.156.0.
- [Release notes](https://github.com/googleapis/google-api-python-client/releases)
- [Commits](googleapis/google-api-python-client@v2.155.0...v2.156.0)

---
updated-dependencies:
- dependency-name: google-api-python-client
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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