chore(deps): update dependency google-cloud-pubsub to v2.7.1 (#204)

Co-authored-by: Anthonios Partheniou <[email protected]>

Author: 2 people

bigquery-datatransfer/snippets/requirements-test.txt

@@ -1,4 +1,4 @@
 google-cloud-bigquery==2.24.0
-google-cloud-pubsub==2.7.0
+google-cloud-pubsub==2.7.1
 pytest==6.2.4
 mock==4.0.3