www/py-dj52-django-cors-headers: Remove expired port

2026-06-30 www/py-dj52-django-cors-headers: Obsolete, please use
www/py-django-cors-headers instead

*/py-dj52*: Deprecate/Set to expire

* The counterparts of the py-dj52-* ports were switched to Django 5.2 in
  ce59801b72ef, so the py-dj52-* ports have no more consumers and are
  now obsolete.

* Set a relatively short EXPIRATION_DATE toward the end of June to wrap
  up things neatly before the 2026Q3 branch.

PR:		291707
With hat:	python

*: 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-dj52-django-cors-headers: Update to 4.9.0

Changelog since 4.7.0:

https://github.com/adamchainz/django-cors-headers/blob/4.9.0/CHANGELOG.rst

net-mgmt/netbox: Create Django 5.2 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 4.3 release possible because it requires
  Django 5.2.

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

  - devel/py-dj52-django-rq
  - devel/py-dj52-strawberry-graphql