Drop asynctest (#44746)

tests/helpers/test_frame.py

@@ -1,10 +1,10 @@
 """Test the frame helper."""
+from unittest.mock import Mock, patch
+
 import pytest
 
 from homeassistant.helpers import frame
 
-from tests.async_mock import Mock, patch
-
 
 async def test_extract_frame_integration(caplog):
     """Test extracting the current frame from integration context."""