Fix tz_localize(None) with Arrow timestamp

Author: yuanx749

pandas/core/arrays/arrow/array.py

@@ -2953,7 +2953,7 @@ def _dt_tz_localize(
         if nonexistent_pa is None:
             raise NotImplementedError(f"{nonexistent=} is not supported")
         if tz is None:
-            result = self._pa_array.cast(pa.timestamp(self.dtype.pyarrow_dtype.unit))
+            result = pc.local_timestamp(self._pa_array)
         else:
             result = pc.assume_timezone(
                 self._pa_array, str(tz), ambiguous=ambiguous, nonexistent=nonexistent_pa

pandas/tests/extension/test_arrow.py

@@ -2686,7 +2686,6 @@ def test_dt_tz_localize_unsupported_tz_options():
         ser.dt.tz_localize("UTC", nonexistent="NaT")
 
 
-@pytest.mark.xfail(reason="Converts to UTC before localizing GH#61780")
 def test_dt_tz_localize_none():
     ser = pd.Series(
         [datetime(year=2023, month=1, day=2, hour=3), None],