Update django to 3.2.13 in dev.in too

[La0]

The dev.in was still referencing the old version of Django, this changes affects unit tests on CI and local development (but not in stage nor production).

Packages updated:

• pytest-django to get official support for django 3.2
• pytest-freezegun is not compatible with django 3.2, we have to use a fork (as long as this issue is not fixed)
• dockerflow to get support for django 3.2 (and even 4.0)

After these dependencies were updated, the tests only failed on the issue already detected in Bug 1768270 about aggregate in cycle_data. The id=Max("id") was useless and introduces an incompatibility in Django 3.2 as the following Count must use a field, and not an aggregate (which made no sense).