Fix import sorting issues reported by isort

Author: Japanuspus

pandas/tests/groupby/test_custom_metadata.py

@@ -8,11 +8,12 @@
 [guidelines]: https://pandas.pydata.org/pandas-docs/stable/development/extending.html#override-constructor-properties  # noqa
 """
 
-import pytest
-import pandas as pd
-from warnings import warn
 from typing import List
+from warnings import warn
 
+import pytest
+
+import pandas as pd
 
 _TABLE_METADATA_FIELD_NAME = "_pandastable_metadata"