Can't unpin packaging dependency

[nedbat]

requirements/constraints.txt has:

# greater version breaking test.
packaging==21.3

I tried removing that constraint and running make upgrade then make test. Sure enough, a test fails:

FAILED tests/test_check_django_deps.py::test_django_deps_upgrade[/System/Volumes/Data/root/src/edx/src/edx-repo-health/tests/fake_repos/python_repo] - packaging.version.InvalidVersion: Invalid version: 'p'
'p' is not a valid package

Digging into it, this is because tests/data/mock_django_dependencies_sheet.csv has:

,Django Package Name,edX Owned?,Python 3.9,Django 3.0,Django 3.1,Django 3.2,Last Checked,Ticket URL,Notes,openedxstats
37,edx-django-sites-extensions,yes,-,3.1.0,3.1.0,3.1.0,"Jul 28, 2021",BOM-2681,,
40,edx-opaque-keys,yes,-,2.2.0,2.2.0,-,"Feb 1, 2021",,,
103,django-storages,,1.11,1.8,1.1,-,"Jun 21, 2021",https://github.com/edx/upgrades/issues/44,,
110,edx-django-utils,yes,-,master,4.2.0,4.2.0,"Jul 14, 2021",BOM-2634,,
30,djangorestframework,,3.12.3,3.11.0,3.12.0,p,"Jun 30, 2021",,,3.12.4              <<<<<<<<<<
29,django-waffle,,2.2.0,0.19.0,2.0.0,-,"May 22, 2021",,,

The arrowed line has a version of "p".

It was changed in a Python Requirements Update by edx-requirements-bot:

 110,edx-django-utils,yes,-,master,4.2.0,4.2.0,"Jul 14, 2021",BOM-2634,,
-30,djangorestframework,,3.12.3,3.11.0,3.12.0,master,"Jun 30, 2021",,,3.12.4
+30,djangorestframework,,3.12.3,3.11.0,3.12.0,p,"Jun 30, 2021",,,3.12.4
 29,django-waffle,,2.2.0,0.19.0,2.0.0,-,"May 22, 2021",,,

I don't know what the version "p" is supposed to mean, or why packaging==21.3 was ok with it, and packaging==23.2 is not. If I manually change the version in the .csv to "master", the test fails because master is also not a valid version.

[iamsobanjaved]

PR:

• Upgrading packing #456