gensim on Windows arm64 system probably downloads unsupported NumPy version during building from source

[filip-komarzyniec]

Problem description

Looking at the meta package oldest-supported-numpy I see that numpy<1.18.5 will be downloaded for python 3.8 and Windows on arm64 (apart from all non-arm64 and non-aarch64 platforms).

I believe then that the check specified in pyproject.toml file will download an invalid (and unsupported by gensim) version of the NumPy library for the Windows on arm64 users:

# oldest supported Numpy for this platform is 1.17 but the oldest supported by Gensim
    # is 1.18.5, remove the line when they increase oldest supported Numpy for this platform
    "numpy==1.18.5; python_version=='3.8' and platform_machine not in 'arm64|aarch64'",

Steps/code/corpus to reproduce

As the issue is a side-effect of a discussion from a different PR (#3538 (comment)) I do not have a minimal reproducible example.
I do not have direct access to Windows on arm64 so I'll try virtualising the architecture and building gensim there. Once I'm done I'll upload the output.

Versions

Python 3.8
Windows 10
arm64 architecture