Fix failing test_in_numeric_groupby

Author: jbrockmendel

pandas/tests/extension/base/groupby.py

@@ -6,7 +6,6 @@
     is_bool_dtype,
     is_numeric_dtype,
     is_object_dtype,
-    is_string_dtype,
 )
 
 import pandas as pd
@@ -151,7 +150,6 @@ def test_in_numeric_groupby(self, data_for_grouping):
             is_numeric_dtype(dtype)
             or is_bool_dtype(dtype)
             or dtype.name == "decimal"
-            or is_string_dtype(dtype)
             or is_object_dtype(dtype)
             or dtype.kind == "m"  # in particular duration[*][pyarrow]
         ):