Drop asynctest (#44746)

tests/components/twilio/test_init.py

@@ -1,10 +1,10 @@
 """Test the init file of Twilio."""
+from unittest.mock import patch
+
 from homeassistant import data_entry_flow
 from homeassistant.components import twilio
 from homeassistant.core import callback
 
-from tests.async_mock import patch
-
 
 async def test_config_flow_registers_webhook(hass, aiohttp_client):
     """Test setting up Twilio and sending webhook."""