Add setuptools to install_requires (#2721)

* Add setuptools to install_requires

When installing a pre-built wheel in a venv on Python 3.12, calling
`nrniv` fails because the wrapper script uses `setuptools` for some
functionality, so it should also be added as a runtime dependency.

* Fix formatting

---------

Co-authored-by: Goran Jelic-Cizmek <goran.jelic-cizmek@epfl.ch>

setup.py

@@ -566,7 +566,8 @@ def setup_package():
             if f[0] != "_"
         ],
         cmdclass=dict(build_ext=CMakeAugmentedBuilder, docs=Docs),
-        install_requires=["numpy>=1.9.3", "packaging"] + maybe_patchelf,
+        install_requires=["numpy>=1.9.3", "packaging", "find_libpython", "setuptools"]
+        + maybe_patchelf,
         tests_require=["flake8", "pytest"],
         setup_requires=["wheel"] + maybe_docs + maybe_test_runner + maybe_rxd_reqs,
         dependency_links=[],