chore(deps): update dependency google-api-python-client to v1.12.2 [(#4751)](GoogleCloudPlatform/python-docs-samples#4751)

Author: renovate-bot

samples/snippets/api/requirements.txt

@@ -1,3 +1,3 @@
-google-api-python-client==1.12.1
+google-api-python-client==1.12.2
 google-auth==1.21.3
 google-auth-httplib2==0.0.4