youtube-dl doesn't work anymore

See:

- https://www.reddit.com/r/youtubedl/comments/13ie3us/does_youtubedl_still_work_or_has_it_been_replaced/
- https://www.reddit.com/r/youtubedl/comments/1435777/youtubedl_no_longer_works_for_me_and_i_have_no/

Since JavaYTD depends on it, it's no longer working either.

JavaYTD could be updated to use https://github.com/yt-dlp/yt-dlp instead.