chore(deps): update dependency google-cloud-pubsub to v2.12.0 (#369)

Author: renovate-bot

dlp/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-dlp==3.6.2
 google-cloud-storage==2.2.1
-google-cloud-pubsub==2.11.0
+google-cloud-pubsub==2.12.0
 google-cloud-datastore==2.5.1
 google-cloud-bigquery==3.0.1