chore(deps): update all dependencies (#493)

Author: renovate-bot

samples/snippets/requirements.txt

@@ -1,5 +1,5 @@
-google-cloud-dlp==3.11.1
+google-cloud-dlp==3.12.0
 google-cloud-storage==2.7.0
-google-cloud-pubsub==2.14.1
-google-cloud-datastore==2.13.2
-google-cloud-bigquery==3.5.0
+google-cloud-pubsub==2.15.0
+google-cloud-datastore==2.14.0
+google-cloud-bigquery==3.6.0