devel/py-dj51-django-rq: Remove expired port

2025-12-31 devel/py-dj51-django-rq: Extended support of Django 5.1 ends December
2025, upgrade to the Django 5.2+ version of this port. See
https://www.djangoproject.com/download/

*: Revise USES=python:... version range constraints

and strip all lower bounds of 3.9 or 3.10 because they are implied now.

python:3.9-X  -> python:-X
python:3.9+   -> python
python:3.10-X -> python:-X
python:3.10+  -> python
(options such as ,build preserved)

*/*dj51*: Deprecate/Set to expire

* Django 5.1 will reach its End-of-Life in December 2025.  Deprecate its
  consumers and set the expiration date accordingly.

* Note: py-dj51-django-netfields does not currently have a corresponding
  Django 5.2 clone, yet, which will probably be added soon when
  net-mgmt/peering-manager is switched to Django 5.2.

Reviewed by:	sunpoet
With hat:	python
Differential Revision:	https://reviews.freebsd.org/D52511

devel/py-dj51-django-rq: Convert to USE_PYTHON=pep517

- Sync with devel/py-django-rq
- Bump PORTREVISION for package change

python: bump all USE_PYTHON=distutils consumers after RUN_DEPENDS removal

Any missed ports, feel free to bump.

Any ports that need setuptools at runtime can have the devel/py-setuptools
manually added back to RUN_DEPENDS, but understand that this practice
is deprecated; see CHANGES for details.

net-mgmt/netbox: Create Django 5.1 consumers

* Django 4.2 is currently the "default" version in the ports tree due
  its long term support until April 2026.  Thus ports that are assigned
  to that version will exist until then.

  The following ports are required to make the upgrade of
  net-mgmt/netbox to the 4.2 release possible because it requires
  Django 5.1.

  All of the ports listed below were created on the basis of their
  respective original ports:

  - devel/py-dj51-django-rq
  - devel/py-dj51-strawberry-graphql