Adds updates for samples profiler ... vision [(#2439)](GoogleCloudPlatform/python-docs-samples#2439)

Author: gguuss

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

@@ -1 +1 @@
-google-cloud-pubsub==0.39.1
+google-cloud-pubsub==1.0.0

packages/google-cloud-pubsub/samples/snippets/subscriber_test.py

@@ -16,6 +16,7 @@
 import time
 
 from gcp_devrel.testing import eventually_consistent
+from gcp_devrel.testing.flaky import flaky
 from google.cloud import pubsub_v1
 import google.api_core.exceptions
 import mock
@@ -193,6 +194,7 @@ def new_sleep(period):
     return mock.patch('time.sleep', new=new_sleep)
 
 
+@flaky
 def test_receive(publisher_client, topic, subscription, capsys):
     _publish_messages(publisher_client, topic)