[neon-notifications] Dev Required: fluidsynth - 2.5.4

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-noble_fluidsynth-noble/38/display/redirect

#<Debian::UScan::DEHS::Package:0x00007b3048f29998 @name="fluidsynth", @debian_uversion="2.5.2+dfsg", @debian_mangled_uversion="2.5.2", @upstream_version="2.5.4", @upstream_url="https://github.com/FluidSynth/fluidsynth/archive/refs/tags/v2.5.4.tar.gz", @status="Newer version available">