chore(deps): update dependency google-auth to v2.6.4 (#402)

Author: renovate-bot

dataproc/snippets/requirements.txt

@@ -1,7 +1,7 @@
 
 backoff==1.11.1
 grpcio==1.44.0
-google-auth==2.6.3
+google-auth==2.6.4
 google-auth-httplib2==0.1.0
 google-cloud==0.34.0
 google-cloud-storage==2.2.1