Drop asynctest (#44746)

tests/components/telegram/test_notify.py

@@ -1,5 +1,6 @@
 """The tests for the telegram.notify platform."""
 from os import path
+from unittest.mock import patch
 
 from homeassistant import config as hass_config
 import homeassistant.components.notify as notify
@@ -7,8 +8,6 @@ from homeassistant.components.telegram import DOMAIN
 from homeassistant.const import SERVICE_RELOAD
 from homeassistant.setup import async_setup_component
 
-from tests.async_mock import patch
-
 
 async def test_reload_notify(hass):
     """Verify we can reload the notify service."""