fix(deps): update dependency google/cloud-pubsub to v2 (#2007)

Author: renovate-bot

dlp/composer.json

@@ -3,6 +3,6 @@
     "type": "project",
     "require": {
         "google/cloud-dlp": "^1.12",
-        "google/cloud-pubsub": "^1.49"
+        "google/cloud-pubsub": "^2.0"
     }
 }