fix(deps): update dependency @google-cloud/common to v4 (#1090)

Author: renovate-bot

package.json

@@ -44,7 +44,7 @@
     "precompile": "gts clean"
   },
   "dependencies": {
-    "@google-cloud/common": "^3.0.0",
+    "@google-cloud/common": "^4.0.0",
     "acorn": "^8.0.0",
     "coffeescript": "^2.0.0",
     "console-log-level": "^1.4.0",