Update dependency google-cloud-scheduler to v1.3.0 [(#3840)](GoogleCloudPlatform/python-docs-samples#3840)

Author: renovate-bot

packages/google-cloud-scheduler/samples/snippets/requirements.txt

@@ -1,3 +1,3 @@
 Flask==1.1.2
 gunicorn==20.0.4
-google-cloud-scheduler==1.2.1
+google-cloud-scheduler==1.3.0