[neon-notifications] Dev Required: fluidsynth - 2.5.5

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-noble_fluidsynth-noble/89/display/redirect

#<Debian::UScan::DEHS::Package:0x00007aad0aee1ec0 @name="fluidsynth", @debian_uversion="2.5.3+dfsg", @debian_mangled_uversion="2.5.3", @upstream_version="2.5.5", @upstream_url="https://github.com/FluidSynth/fluidsynth/archive/refs/tags/v2.5.5.tar.gz", @status="Newer version available">