chore(deps): update dependency google-cloud-storage to v2.1.0 (#469)

Author: renovate-bot

samples/snippets/requirements.txt

@@ -1,4 +1,5 @@
 google-cloud-logging==2.7.0
 google-cloud-bigquery==2.32.0
-google-cloud-storage==2.0.0
+google-cloud-storage==2.0.0; python_version == '3.6'
+google-cloud-storage==2.1.0; python_version >= '3.7'
 google-cloud-pubsub==2.9.0