Remove django makemessage patch if django >= 4.1.3 is available in debian stable

Debexpo overrides the makemessages command for ease of use, by settings some additional defaults.

In addition, it implement a patch from django upstream fixing the po files being updated if no sources strings are modified.

• Upstream patch: https://github.com/django/django/commit/4bfe8c0eec835b8eaffcda7dc1e3b203751a790a
• Debexpo source: https://salsa.debian.org/mentors.debian.net-team/debexpo/-/tree/live/debexpo/override/management/commands/makemessages.py#L109
• Django PTS: https://tracker.debian.org/pkg/python-django

This patch should be removed when django >= 4.1.3 as landed in stable. (Most likely for trixie)