chore(deps): update dependency google-cloud-storage to v2.1.0 (#323)

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

* pin google-cloud-storage==2.0.0 for python 3.6

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Author: renovate-bot

samples/snippets/requirements.txt

@@ -1,3 +1,4 @@
 google-cloud-translate==3.6.1
-google-cloud-storage==2.0.0
+google-cloud-storage==2.0.0; python_version == '3.6'
+google-cloud-storage==2.1.0; python_version > '3.6'
 google-cloud-automl==2.6.0