chore(deps): update dependency google-cloud-pubsub to v2.9.0 (#441)

Author: renovate-bot

logging/samples/snippets/requirements.txt

@@ -1,4 +1,4 @@
 google-cloud-logging==2.7.0
 google-cloud-bigquery==2.30.1
 google-cloud-storage==1.42.3
-google-cloud-pubsub==2.8.0
+google-cloud-pubsub==2.9.0