Replace discouraged pkg_resources for Python 3.9+

See https://setuptools.readthedocs.io/en/latest/pkg_resources.html
2 jobs for importlib in 7 minutes and 14 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #22294
code-quality

00:05:04

3.0%
 
  Build
passed #22295
linux

00:02:09