fix(deps): explicit update to google-auth-library with various fixes (#785)

Author: Benjamin E. Coe

handwritten/pubsub/package.json

@@ -61,7 +61,7 @@
     "arrify": "^2.0.0",
     "async-each": "^1.0.1",
     "extend": "^3.0.2",
-    "google-auth-library": "^5.0.0",
+    "google-auth-library": "^5.5.0",
     "google-gax": "^1.6.3",
     "is-stream-ended": "^0.1.4",
     "lodash.snakecase": "^4.1.1",