Enhancement: stop using `pkg_resources`

[GideonBear]

From the setuptools documentation:

Use of pkg_resources is deprecated in favor of importlib.resources, importlib.metadata and their backports (importlib_resources, importlib_metadata). Users should refrain from new usage of pkg_resources and should work to port to importlib-based solutions.

python -Wall -c 'import docxcompose.properties' outputs:

.../venv/lib/python3.9/site-packages/pkg_resources/__init__.py:121: DeprecationWarning: pkg_resources is deprecated as an API
  warnings.warn("pkg_resources is deprecated as an API", DeprecationWarning)

[rafguns]

Is anyone from 4teamwork able to merge PR #91 and ideally release a new version of this package on PyPI? This would be much appreciated by those of us on Python 3.12 or later. @buchi @lukasgraf

[ThbtSprt]

Maybe @Abdu-moustafa who seems to be active on 4teamwork repos

[USSX-Hares]

+1 here.
Blocks my documentation generation.

[daldbv314]

+1

[StevenMapes]

Hopefully the PR will be merged and released soon since the pkg_resources package is slated for removal as early as 2025-11-30 and we're getting there fast!