Drop asynctest (#44746)

tests/components/sun/test_init.py

@@ -1,5 +1,6 @@
 """The tests for the Sun component."""
 from datetime import datetime, timedelta
+from unittest.mock import patch
 
 from pytest import mark
 
@@ -9,8 +10,6 @@ import homeassistant.core as ha
 from homeassistant.setup import async_setup_component
 import homeassistant.util.dt as dt_util
 
-from tests.async_mock import patch
-
 
 async def test_setting_rising(hass, legacy_patchable_time):
     """Test retrieving sun setting and rising."""