Failure of submitit 1.5.1 with python 3.12 because of missing pkg_resources

[GianlucaFicarelli]

From https://setuptools.pypa.io/en/latest/pkg_resources.html

Use of pkg_resources is deprecated in favor of importlib.resources, importlib.metadata and their backports

In python 3.12, setuptools isn't installed automatically, so pkg_resources might not be available, and submitit will fail.
For example, in a clean python 3.12 venv (without setuptools installed):

❯ pip list
Package           Version
----------------- -------
cloudpickle       3.0.0
pip               24.0
submitit          1.5.1
typing_extensions 4.11.0

>>> from submitit.core.plugins import get_executors
>>> get_executors()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/private/tmp/venv/lib/python3.12/site-packages/submitit/core/plugins.py", line 65, in get_executors
    return {ex.name(): ex for ex in _get_plugins()[0]}
                                    ^^^^^^^^^^^^^^
  File "/private/tmp/venv/lib/python3.12/site-packages/submitit/core/plugins.py", line 24, in _get_plugins
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'

Needed fix: pkg_resources should be replaced by importlib.
In the meantime, a temporary workaround is to explicitly install setuptools