Sort imports for requirements.py and its test using isort (#29836)

Unblocks https://github.com/home-assistant/home-assistant/pull/29739

homeassistant/requirements.py

@@ -3,7 +3,7 @@ import asyncio
 import logging
 import os
 from pathlib import Path
-from typing import Any, Dict, List, Optional, Set, Iterable
+from typing import Any, Dict, Iterable, List, Optional, Set
 
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import HomeAssistantError

tests/test_requirements.py

@@ -2,9 +2,10 @@
 import os
 from pathlib import Path
 from unittest.mock import call, patch
+
 import pytest
 
-from homeassistant import setup, loader
+from homeassistant import loader, setup
 from homeassistant.requirements import (
     CONSTRAINT_FILE,
     PROGRESS_FILE,