add back str_slice compat

Author: jorisvandenbossche

pandas/core/arrays/_arrow_string_mixins.py

@@ -131,6 +131,10 @@ def _str_get(self, i: int) -> Self:
     def _str_slice(
         self, start: int | None = None, stop: int | None = None, step: int | None = None
     ) -> Self:
+        if pa_version_under13p0:
+            # GH#59724
+            result = self._apply_elementwise(lambda val: val[start:stop:step])
+            return type(self)(pa.chunked_array(result, type=self._pa_array.type))
         if start is None:
             if step is not None and step < 0:
                 # GH#59710