chore(deps): update dependency google-cloud-storage to v1.28.1 [(#3785)](GoogleCloudPlatform/python-docs-samples#3785)

* chore(deps): update dependency google-cloud-storage to v1.28.1

* [asset] testing: use uuid instead of time

Co-authored-by: Takashi Matsuo <tmatsuo@google.com>

Author: renovate-bot

samples/snippets/requirements.txt

@@ -2,5 +2,5 @@ grpcio==1.29.0
 google-auth==1.14.3
 google-auth-httplib2==0.0.3
 google-cloud==0.34.0
-google-cloud-storage==1.28.0
+google-cloud-storage==1.28.1
 google-cloud-dataproc==0.7.0