Intersphinx typehints are not properly parsed

[wolearyc]

Hi,

First of all, thanks so much for your work on this package! I've been considering transitioning to autoapi from sphinx-apidoc, but autoapi seems to be having trouble translating my type hints into nice, fully-hyperlinked types. Things seem to fail especialy when using type aliases and/or bracket notation. I've reproduced the problem in this toy example:
https://github.com/wolearyc/autoapi-test.

Python file

"""Main file."""

import numpy as np
from numpy.typing import NDArray
from typing import Sequence, Any


def function_a(x: NDArray[np.float64]):
    """Do something.

    Parameters
    ----------
    x
        type hint doesn't link
    """
    pass


def function_b(x: NDArray):
    """Do something.

    Parameters
    ----------
    x
        type hint doesn't link
    """
    pass


def function_b(x: np.ndarray):
    """Do something.

    Parameters
    ----------
    x
        type hint works as expected
    """
    pass


def function_b(x: np.ndarray[Any, np.dtype[np.float64]]):
    """Do something.

    Parameters
    ----------
    x
        bits of pieces of the type are linked properly
    """
    pass

Sphinx generates the following documentation:

I think intersphinx is working properly, as in some cases the suitable links are generated. However, link generation fails in many of the cases. All of this works seamlessly with sphinx-apidoc (for example, see my current docs here https://ramannoodle.readthedocs.io/en/latest/generated/ramannoodle.dynamics.html), so I'm not sure what's going on.

Hopefully this is a simple fix and/or a silly goof on my part!

OS: MacOS 14.6
Python: 3.12.4
autoapi: 3.3.1
Sphinx: 8.0.2
sphinx-autodoc-typehints: 2.4.4