fix(deps): update dependency @google-cloud/common to v4 (#529)

Author: renovate-bot

packages/google-cloud-dns/package.json

@@ -44,7 +44,7 @@
     "precompile": "gts clean"
   },
   "dependencies": {
-    "@google-cloud/common": "^3.0.0",
+    "@google-cloud/common": "^4.0.0",
     "@google-cloud/paginator": "^4.0.0",
     "@google-cloud/promisify": "^3.0.0",
     "arrify": "^2.0.0",