www/py-django-dpaste: Mark as BROKEN and set to expire

* There is a reported issue with py-pygments >= 2.12.0 at the upstream
  repository which is still unresolved since nearly two years.  In the
  FreeBSD ports tree, textproc/py-pygments is already at 2.17.2.

* If one tries to set an own Django instance, some static files
  (= dpaste.css + dpaste.js) seem to be missing, which have to be
  compiled in advance using Node.js/npm.

The port is not usable in its current state, thus mark it as BROKEN and
set an expiration date.  If you need this port feel free to undeprecate
and take over maintainership.

Approved by:	bofh (maintainer, implicit)