multimedia/shotcut: update to 12.12.31

ChangeLog: https://www.shotcut.org/blog/new-release-191231/

• Moving multiple clips on the Timeline
• Allow reducing track height to very short in Timeline and Keyframes.
• Fixed crackly audio playback for some Windows users.
• Fixed loading project files made before v19.06 when not using a period for a decimal point.
• Fixed Lift and Ripple Delete on Timeline not reliably removing all selected.
• Fixed checking Properties > Image sequence may not update duration in Playlist.
• Fixed the intra-VLC and non-linear-quantizer options in
• the XDCAM-422 and D10 export presets.

Reported by: portscout