chore(deps): update dependency google-auth-oauthlib to v0.4.3 (#542)

Author: renovate-bot

samples/snippets/requirements.txt

@@ -1,6 +1,6 @@
 google-cloud-bigquery==2.10.0
 google-cloud-bigquery-storage==2.3.0
-google-auth-oauthlib==0.4.2
+google-auth-oauthlib==0.4.3
 grpcio==1.36.1
 ipython==7.16.1; python_version < '3.7'
 ipython==7.17.0; python_version >= '3.7'