removed object cast for EA dtypes; xref pandas-dev#43152

Author: debnathshoham

pandas/tests/reshape/merge/test_merge_anti.py

@@ -477,7 +477,7 @@ def test_anti_EA_dtypes(self, dtype):
         result = merge(left, right, how="anti_right")
         expected = DataFrame(
             {"A": [4, 5], "B": [pd.NA, pd.NA], "C": [6, 8]}, dtype=dtype
-        ).astype({"A": object})
+        )
         tm.assert_frame_equal(result, expected)
 
     @pytest.mark.parametrize(