[neon-notifications] mlt new version 6.24.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_mlt/70/display/redirect

#<Debian::UScan::DEHS::Package:0x0000562831fb3bc8 @name="mlt", @debian_uversion="6.20.0", @debian_mangled_uversion="6.20.0", @upstream_version="6.24.0", @upstream_url="https://github.com/mltframework/mlt/archive/v6.24.0.tar.gz", @status="Newer version available">