TYP: `bool.__index__` annotation missing

[randolf-scholz]

Describe the issue:

The stub file for np.bool_ lacks the index method.

Reproduce the code example:

import numpy as np
import typing
typing.reveal_type(np.bool_.__index__)

Error message:

No response

Python and NumPy Versions:

2.1.3
3.12.5 (main, Aug 9 2024, 13:11:04) [GCC 11.4.0]

Type-checker version and settings:

mypy 1.13
pyright 1.1.388

Additional typing packages.

No response