chore: some lint fixes [(#3736)](GoogleCloudPlatform/python-docs-samples#3736)

Co-authored-by: Leah E. Cole <[email protected]>

Author: Takashi Matsuo

samples/appengine/flexible/tasks/snippets_test.py

@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import os
-import pytest
 import uuid
 
+import pytest
+
 import snippets
 
 TEST_PROJECT_ID = os.getenv('GCLOUD_PROJECT')