fix values

Author: MarcoGorelli

pandas-stubs/core/indexes/period.pyi

@@ -6,7 +6,6 @@ from typing import (
 )
 
 import numpy as np
-import numpy.typing as npt
 import pandas as pd
 from pandas import Index
 from pandas.core.indexes.accessors import PeriodIndexFieldOps
@@ -35,7 +34,7 @@ class PeriodIndex(DatetimeIndexOpsMixin[pd.Period, np.object_], PeriodIndexField
         name: Hashable | None = None,
     ): ...
     @property
-    def values(self) -> npt.NDArray[np.object_]: ...
+    def values(self) -> np.ndarray[tuple[int], np.dtype[np.object_]]: ...
     def __contains__(self, key: object) -> bool: ...
     @overload
     def __sub__(self, other: Period) -> Index: ...