Allow using IntEnums in NDArray type definitions

[TomvdPoll]

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Is your feature request related to a problem? Please describe.
I use both numpy arrays and IntEnums for my project. Since python is perfectly fine with assigning IntEnums to numpy arrays, I would like indicate the specific IntEnum in typehints.

However, this results in a error.

example:

from enum import IntEnum
from numpy.typing import NDArray


class MyIntEnum(IntEnum):
    OPTION_A = 0
    OPTION_B = 1
    OPTION_C = 2


def function_using_array_of_enums(arr: NDArray[MyIntEnum]):
    ...

results in the following error:

error: Could not specialize type "NDArray[_ScalarT@NDArray]"
    Type "MyIntEnum" is not assignable to type "generic[Any]"
      "MyIntEnum" is not assignable to "generic[Any]" (reportInvalidTypeForm)

Describe the solution you’d like
I would like to be able to typehint my code in the example mentioned above, since it allows for a much cleaner and more readable type hint.