Add explicit setuptools dependency

[tomwardio]

For Python >=3.12, setuptools is not longer included by default. Even for older distros, setuptools may not necessarily be included by default (e.g. building locally doesn't necessarily include setuptools).

[tomwardio]

Without explicitly depending on setuptools, tests fail with the following:

ImportError while loading conftest '/tmp/pyranges/tests/unit/conftest.py'.
tests/unit/conftest.py:5: in <module>
    from pyranges import PyRanges
pyranges/__init__.py:8: in <module>
    import pkg_resources
E   ModuleNotFoundError: No module named 'pkg_resources'

[semenko]

I think importlib_resources is the preferred approach.

[tomwardio]

I think importlib_resources is the preferred approach.

Yes that would be even better! I did the minimum to get this package to work with 3.12.