Auto-update dependencies. [(#1658)](GoogleCloudPlatform/python-docs-samples#1658)

* Auto-update dependencies.

* Rollback appengine/standard/bigquery/.

* Rollback appengine/standard/iap/.

* Rollback bigtable/metricscaler.

* Rolledback appengine/flexible/datastore.

* Rollback dataproc/

* Rollback jobs/api_client

* Rollback vision/cloud-client.

* Rollback functions/ocr/app.

* Rollback iot/api-client/end_to_end_example.

* Rollback storage/cloud-client.

* Rollback kms/api-client.

* Rollback dlp/

* Rollback bigquery/cloud-client.

* Rollback iot/api-client/manager.

* Rollback appengine/flexible/cloudsql_postgresql.

Author: dpebot

samples/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-pubsub==0.35.0
+google-cloud-pubsub==0.37.2