Add type hints to the numpy.array_api.Array.__array__ signature

Thanks @BvB93

Original NumPy Commit: 5f21063cc317d92a866c7259a9509f5e5d6189c2

Author: asmeurer

array_api_strict/_array_object.py

@@ -33,6 +33,7 @@
 
 if TYPE_CHECKING:
     from ._typing import Any, PyCapsule, Device, Dtype
+    import numpy.typing as npt
 
 import numpy as np
 
@@ -110,7 +111,7 @@ def __repr__(self: Array, /) -> str:
 
     # This function is not required by the spec, but we implement it here for
     # convenience so that np.asarray(np.array_api.Array) will work.
-    def __array__(self, dtype=None):
+    def __array__(self, dtype: None | np.dtype[Any] = None) -> npt.NDArray[Any]:
         """
         Warning: this method is NOT part of the array API spec. Implementers
         of other libraries need not include it, and users should not assume it