chore(deps): update dependency google-cloud-pubsub to v2.7.0 (#225)

Author: renovate-bot

dlp/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-dlp==3.2.2
 google-cloud-storage==1.41.1
-google-cloud-pubsub==2.6.1
+google-cloud-pubsub==2.7.0
 google-cloud-datastore==2.1.6
 google-cloud-bigquery==2.23.0