Bug#1079175: python3-pkg-resources: pkg_resources cannot be imported: No module named 'packaging'

[Emanuele Rocca <ema@debian.org>]

Package: python3-pkg-resources
Version: 72.2.0-1
Severity: serious
X-Debbugs-CC: debian-boot@lists.debian.org

[debian-boot added to CC as this issue breaks d-i builds]

Importing pkg_resources fails with the following error:

  (sid-amd64-sbuild)ema@ariel:~$ python3
  Python 3.12.5 (main, Aug  7 2024, 13:49:14) [GCC 14.2.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import pkg_resources
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 95, in <module>
      import packaging.specifiers
  ModuleNotFoundError: No module named 'packaging'

This is a regression in version 72.2.0-1, whereas 70.3.0-2 worked fine.

For an example of d-i build failure caused by this problem, see:
https://salsa.debian.org/installer-team/debian-installer/-/jobs/6155545 

It seems that installing python3-packaging, python3-jaraco.text, and
python3-platformdirs fixes it.