Drop asynctest (#44746)

tests/components/config/test_script.py

@@ -1,9 +1,9 @@
 """Tests for config/script."""
+from unittest.mock import patch
+
 from homeassistant.bootstrap import async_setup_component
 from homeassistant.components import config
 
-from tests.async_mock import patch
-
 
 async def test_delete_script(hass, hass_client):
     """Test deleting a script."""