Revert "chore(deps): update dependency google-cloud-pubsub to v1.7.0 (#155)"
Revert "chore(deps): update dependency google-cloud-pubsub to v1.7.0 (#155)"

This reverts commit 475debae9d821c9cb829817d4aca90cce1dd9275.

googleapis/python-pubsub,googleapis/python-pubsub