www/py-dj51-social-auth-app-django: Remove expired port

2025-12-31 www/py-dj51-social-auth-app-django: 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)

www/py-dj51-social-auth-app-django: Update to 5.6.0

Changelog:

https://github.com/python-social-auth/social-app-django/releases/tag/5.6.0

MFH:		2025Q4
Security:	3116b6f3-b433-11f0-82ac-901b0edee044

*/*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

www/py-dj51-social-auth-app-django: Update to 5.5.1

Changelog since 5.4.3:

https://github.com/python-social-auth/social-app-django/blob/5.5.1/CHANGELOG.md

www/py-dj51-social-auth-app-django: New port

Python Social Auth is an easy to setup social
authentication/registration mechanism with support for several
frameworks and auth providers.

This is the Django component of the python-social-auth ecosystem, it
implements the needed functionality to integrate social-auth-core in a
Django based project.