chore(deps): update dependency grpcio to v1.46.3 (#422)

Author: renovate-bot

dataproc/snippets/requirements.txt

@@ -1,6 +1,6 @@
 
 backoff==2.0.1
-grpcio==1.46.1
+grpcio==1.46.3
 google-auth==2.6.6
 google-auth-httplib2==0.1.0
 google-cloud==0.34.0