pkg_resources is deprecated and removed in Python 3.12

[carlosperate]

From the pkg_resources docs:
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 (importlib_resources, importlib_metadata). Some useful APIs are also provided by packaging (e.g. requirements and version parsing). Users should refrain from new usage of pkg_resources and should work to port to importlib-based solutions.

Python 3.12 has removed pkg_resources from the standard library (moved to setuptools):
https://docs.python.org/3/whatsnew/3.12.html

gh-95299: Do not pre-install setuptools in virtual environments created with venv. This means that distutils, setuptools, pkg_resources, and easy_install will no longer available by default; to access these run pip install setuptools in the activated virtual environment.

And we use it in the resources/__init__.py file:

mu/mu/resources/__init__.py

Line 20 in c38a539

from pkg_resources import resource_filename, resource_string

Good news is that the importlib_resources backport library contains documentation on how to migrate:
https://importlib-resources.readthedocs.io/en/latest/migration.html#pkg-resources-resource-filename