chore(deps): update dependency google-auth-oauthlib to v0.4.2 (#349)

Author: renovate-bot

samples/snippets/requirements.txt

@@ -1,6 +1,6 @@
 google-cloud-bigquery==2.1.0
 google-cloud-bigquery-storage==2.0.0
-google-auth-oauthlib==0.4.1
+google-auth-oauthlib==0.4.2
 grpcio==1.33.1
 ipython==7.16.1; python_version < '3.7'
 ipython==7.17.0; python_version >= '3.7'