devel/py-rq: update to 2.1.0

Changes:

• job.id must not contain :.
• Various type hint improvements
• job.ended_at should be set when job is run synchronously.
• Group.all() now properly handles non existing group.
• Use ruff instead of black as formatter.

(cherry picked from commit 94460adec72f2285c6748835f161804ed84f719f)