fix(deps): update dependency google-auth-library to v4 (#1270)

Author: renovate[bot]

appengine/pubsub/package.json

@@ -16,7 +16,7 @@
     "@google-cloud/pubsub": "^0.28.0",
     "body-parser": "^1.18.3",
     "express": "^4.16.3",
-    "google-auth-library": "^3.1.2",
+    "google-auth-library": "^4.0.0",
     "pug": "^2.0.1",
     "safe-buffer": "^5.1.2"
   },

endpoints/getting-started-grpc/package.json

@@ -17,7 +17,7 @@
     "test": "repo-tools test run --cmd mocha -- system-test/*.test.js --timeout=60000"
   },
   "dependencies": {
-    "google-auth-library": "^3.0.0",
+    "google-auth-library": "^4.0.0",
     "grpc": "^1.18.0",
     "jsonwebtoken": "^8.2.0",
     "yargs": "^13.2.2"

functions/billing/package.json

@@ -12,7 +12,7 @@
   "author": "Ace Nassri <anassri@google.com>",
   "license": "Apache-2.0",
   "dependencies": {
-    "google-auth-library": "^3.0.0",
+    "google-auth-library": "^4.0.0",
     "googleapis": "^39.0.0",
     "slack": "^11.0.1"
   },