fixing formatting

Author: mashraf-222

tests/test_optional/test_figure_factory/test_validate_gantt.py

@@ -254,4 +254,4 @@ def test_dataframe_column_order_and_index():
     assert len(result) == 2
     # Ensure values preserved regardless of order/index
     assert result[0]["Task"] == "A"
-    assert set(result[0].keys()) == set(["Task", "Start", "Finish"])
+    assert set(result[0].keys()) == set(["Task", "Start", "Finish"])