devel/py-graphene-django300: Deprecate/Set to expire

• The port was used as a temporary solution in 547ee8e902f4 due to compatibility issues with net-mgmt/netbox and it's bound to Django 4.2.
  
  It no longer has any consumers, thus deprecate it accordingly as part of the Django 4.2 -> 5.2 migration.

• Although www/py-django42 will not reach its EoL until April, set the EXPIRATION_DATE accordingly at the end of 2026Q1 to get a clean cut with regard to the quarterly branch.

PR: 291707