multimedia/py-scenedetect: Update 0.6.6 => 0.6.7, take maintainership
Changelog:
https://www.scenedetect.com/changelog/#pyscenedetect-067-august-24-2025
- Change the master site from GitHub to PYPI as per the FreeBSD Python policy.
- Add multimedia/ffmpeg since upstream supports and mentions in the doc that it can use mkvmerge or ffmpeg.
PR: 289116