chore(deps): update dependency google-api-python-client to v1.12.1 [(#4674)](GoogleCloudPlatform/python-docs-samples#4674)

Author: renovate-bot

samples/snippets/api/requirements.txt

@@ -1,3 +1,3 @@
-google-api-python-client==1.11.0
+google-api-python-client==1.12.1
 google-auth==1.21.2
 google-auth-httplib2==0.0.4