Remove deprecated usage of setup.py

[matrss]

However, python setup.py and the use of setup.py as a command line tool are deprecated.

This means that commands such as the following MUST NOT be run anymore:

• python setup.py install

• python setup.py develop

• python setup.py sdist

• python setup.py bdist_wheel

https://packaging.python.org/en/latest/discussions/setup-py-deprecated/

We have this kind of usage here:

MSS/localbuild/bld.bat

Line 8 in 3e0f74c

%PYTHON% setup.py install --single-version-externally-managed --record record.txt

[ReimarBauer]

But it has also a site effect for us on
https://docs.conda.io/projects/conda-build/en/stable/user-guide/tutorials/build-pkgs.html#writing-the-build-script-files-build-sh-and-bld-bat

We maybe have to pin setuptools for 8.3.5

[ReimarBauer]

conda/conda-build#5311

[ReimarBauer]

We recheck this short for the release.

[ReimarBauer]

conda/menuinst#202

[ReimarBauer]

I shift this to the next major because that needs some effort on conda-build to track that down.

[ReimarBauer]

When this is fixed we can remove it
conda/conda-build#5311