chore(deps): update dependency google-cloud-pubsub to v2.13.6 (#471)

Author: renovate-bot

asset/snippets/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-storage==2.5.0
 google-cloud-asset==3.11.0
 google-cloud-resource-manager==1.6.0
-google-cloud-pubsub==2.13.5
+google-cloud-pubsub==2.13.6
 google-cloud-bigquery==3.3.1