[neon-notifications] Dev Required: mlt - 7.40.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-noble_mlt-noble/592/display/redirect

#<Debian::UScan::DEHS::Package:0x0000798c62479b28 @name="mlt", @debian_uversion="7.38.0", @debian_mangled_uversion="7.38.0", @upstream_version="7.40.0", @upstream_url="https://github.com/mltframework/mlt/releases/download/v7.40.0/mlt-7.40.0.tar.gz", @status="Newer version available">