chore: some lint fixes [(#3749)](GoogleCloudPlatform/python-docs-samples#3749)

Author: Takashi Matsuo

samples/snippets/snippets_test.py

@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 
 import os
-import pytest
 import uuid
 
-from quickstart import quickstart
+from google.api_core import exceptions
+from google.cloud import secretmanager
+import pytest
+
 from access_secret_version import access_secret_version
 from add_secret_version import add_secret_version
 from create_secret import create_secret
@@ -29,11 +31,9 @@
 from iam_revoke_access import iam_revoke_access
 from list_secret_versions import list_secret_versions
 from list_secrets import list_secrets
+from quickstart import quickstart
 from update_secret import update_secret
 
-from google.api_core import exceptions
-from google.cloud import secretmanager
-
 
 @pytest.fixture()
 def client():