chore(deps): update dependency grpcio to v1.38.1 (#208)

Author: renovate-bot

dataproc/snippets/requirements.txt

@@ -1,6 +1,6 @@
 
 backoff==1.10.0
-grpcio==1.38.0
+grpcio==1.38.1
 google-auth==1.31.0
 google-auth-httplib2==0.1.0
 google-cloud==0.34.0