Update mock assertion method for Py 3.12 for #814

Author: machawk1

tests/test_error_handler.py

@@ -24,4 +24,4 @@ def test_catch():
     with patch('ipwb.error_handler.logger.critical', mock_logger):
         caught_error('boo')
 
-    assert mock_logger.called_once_with(('boo', ))
+    assert mock_logger.assert_called_once_with(('boo', ))