Installation fails unless using --use-pep517

[israelmcmc]

Astromodels fails to install on new setuptools versions (I'm using 70.0.0) unless you specify pip install --use-pep517

As explained here this is due to an issue when using setup_requires

In astromodels, this happens here:

astromodels/setup.py

Line 405 in d5c5416

setup_requires=['numpy'],

While this might be solved on the setuptools side (see this issue), I wondering if astronomodels still really needs setup_requires or if that code is there for historical reason and can be removed now (which would make the installation easier for users).