chore(deps): bump google-api-python-client in /classroom/quickstart

Bumps [google-api-python-client](https://github.com/googleapis/google-api-python-client) from 1.7.9 to 2.156.0.
- [Release notes](https://github.com/googleapis/google-api-python-client/releases)
- [Commits](googleapis/google-api-python-client@v1.7.9...v2.156.0)

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

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

Author: dependabot[bot]

classroom/quickstart/requirements.txt

@@ -1,3 +1,3 @@
-google-api-python-client==1.7.9
+google-api-python-client==2.156.0
 google-auth-httplib2==0.0.3
 google-auth-oauthlib==0.4.0