Update dependency google-cloud-pubsub to v1.4.2 in Storage and Pub/Sub [(#3343)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/3343)
Update dependency google-cloud-pubsub to v1.4.2 in Storage and Pub/Sub [(#3343)](https://github.com/GoogleCloudPlatform/python-docs-samples/issues/3343)


googleapis/python-pubsub,googleapis/python-pubsub