Update youtube-viewer to 3.9.6 and switch to yt-dlp

Summary:
Update youtube-viewer to 3.9.6 and switch to yt-dlp

Highlighted Changes:

• Added support for local subscription videos (-ls)
• Added support for local playlists in the Gtk3 version
• Added support for saving YouTube playlists locally (--save-playlist=ID)
• Added support for local playlists. (-lp, --local-playlists)
• Added support for listing saved channels from file (-lc, --local-channels)
• Added support for yt-dlp

See T10001

Depends on D12196

Test Plan: Viewed a couple of YouTube videos

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Subscribers: JoshStrobl

Differential Revision: https://dev.getsol.us/D12199