Fix typing error (specifically, isort) in test_complex.py

Author: micol-altomare

pandas/tests/io/pytables/test_complex.py

@@ -2,14 +2,13 @@
 import pytest
 
 import pandas as pd
-import pandas._testing as tm
 from pandas import (
     DataFrame,
     HDFStore,
     Series,
     read_hdf,
 )
-
+import pandas._testing as tm
 
 tables = pytest.importorskip("tables")