chore(deps): update dependency google-cloud-pubsub to v2.4.2 (#148)

Author: renovate-bot

dlp/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-dlp==3.0.1
 google-cloud-storage==1.38.0
-google-cloud-pubsub==2.4.1
+google-cloud-pubsub==2.4.2
 google-cloud-datastore==2.1.0
 google-cloud-bigquery==2.14.0