message: Update google-auto-auth.
diff: "eventid": "^0.1.0",
  "extend": "^3.0.1",
  "gcp-metadata": "^0.4.0",
  - "google-auto-auth": "^0.7.1",
  + "google-auto-auth": "^0.8.0",
  "google-gax": "^0.14.2",
  "google-proto-files": "^0.14.0",
  "is": "^3.0.1",
  