build(deps): bump google-api-python-client from 2.155.0 to 2.156.0

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]>

requirements.txt

@@ -39,7 +39,7 @@ Flask-Caching==2.3.0
 flask-gae-static==1.0
 flask-sock==0.7.0
 google-api-core[grpc]==2.19.1
-google-api-python-client==2.155.0
+google-api-python-client==2.156.0
 google-auth==2.15.0
 google-auth-httplib2==0.2.0
 google-cloud-appengine-logging==1.5.0