Fix formatting in test_pandas3_compatibility.py

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: MaxGhenis

microdf/tests/test_pandas3_compatibility.py

@@ -197,7 +197,6 @@ def test_microdataframe_copy_independent(self):
         # Copy should be unchanged
         assert np.allclose(mdf_copy.weights, [1.0, 2.0, 3.0])
 
-
     def test_column_set_weights_after_access_regression(self):
         """Regression test for pandas 3.0 CoW compatibility.
 
@@ -218,6 +217,7 @@ def test_column_set_weights_after_access_regression(self):
         # Verify the new weights took effect
         assert np.allclose(col.weights, [4.0, 5.0, 6.0])
 
+
 class TestGroupByWithPandas3:
     """Test groupby operations with pandas 3."""