fix(deps): update dependency google-auth-library to v3 (#433)

Author: renovate[bot]

handwritten/pubsub/package.json

@@ -54,7 +54,7 @@
     "delay": "^4.0.0",
     "duplexify": "^3.5.4",
     "extend": "^3.0.1",
-    "google-auth-library": "^2.0.0",
+    "google-auth-library": "^3.0.0",
     "google-gax": "^0.23.0",
     "is": "^3.0.1",
     "is-stream-ended": "^0.1.4",