devel/py-dj41-django-rq: Update to 2.8.1

• Remove PORTSCOUT as net-mgmt/netbox works fine with py-django-rq 2.8.1 and should also work newer releases of the 2.8.x series.

Changelogs since 2.7.0:

https://github.com/rq/django-rq/blob/v2.8.1/CHANGELOG.md
https://github.com/rq/django-rq/blob/v2.8.0/CHANGELOG.md

PR: 271886
Approved by: sunpoet (maintainer)