Numpy 2.0

[achaikou]

Planning to test wheels before making a release, but think it should be ok.

Update:

1. Setuptools just removed test command https://github.com/pypa/setuptools/commit/4c0b9f3ee6ee47c597572655567f215c08c90137 Change is in 72.0, now 70.1 or something near it is picked up, so surprise might yet to come
2. pytest-runner is deprecated. Will have to deal with it somehow https://pytest-runner.readthedocs.io/en/latest/index.html
3. Invoking with python setup.py is deprecated, which is a problem, need to figure out what to do now. https://packaging.python.org/en/latest/discussions/setup-py-deprecated/ Last two points rather not in this PR.

Update 2:

• flow that is affected by setuptools test command is not really in CI (it would be discovered by bigendian job, if setuptools there were updated)
• yes, we fail with newest setuptools (though there is already a version where test command is restored). That is about Unknown distribution option: 'tests_require', but I am not sure if it is our test_require problem or if it is skbuild problem or if it is still setuptools didn't revert something back. I think that even if I don't pin setuptools, nothing should fail here (bigendian anyway using old version). But the issue should be addressed later anyway.

Update 3: Seems like it is our test-require that breaks setuptools. If whole "remove python setup.py test" thing is done, looks like new setuptools works fine.