Sort imports according to PEP8 for 'tests' (#29791)

tests/helpers/test_storage.py

@@ -2,7 +2,7 @@
 import asyncio
 from datetime import timedelta
 import json
-from unittest.mock import patch, Mock
+from unittest.mock import Mock, patch
 
 import pytest
 
@@ -12,7 +12,6 @@ from homeassistant.util import dt
 
 from tests.common import async_fire_time_changed, mock_coro
 
-
 MOCK_VERSION = 1
 MOCK_KEY = "storage-test"
 MOCK_DATA = {"hello": "world"}