Drop asynctest (#44746)

tests/test_config_entries.py

@@ -1,6 +1,7 @@
 """Test the config manager."""
 import asyncio
 from datetime import timedelta
+from unittest.mock import AsyncMock, patch
 
 import pytest
 
@@ -10,7 +11,6 @@ from homeassistant.exceptions import ConfigEntryNotReady
 from homeassistant.setup import async_setup_component
 from homeassistant.util import dt
 
-from tests.async_mock import AsyncMock, patch
 from tests.common import (
     MockConfigEntry,
     MockEntity,