[neon-notifications] Dev Required: libsdl3 - 3.4.2

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-noble_libsdl3-noble/3/display/redirect

#<Debian::UScan::DEHS::Package:0x00007c04cb28bcb0 @name="libsdl3", @debian_uversion="3.2.30+ds", @debian_mangled_uversion="3.2.30", @upstream_version="3.4.2", @upstream_url="https://github.com/libsdl-org/SDL/releases/download/release-3.4.2/SDL3-3.4.2.tar.gz", @status="Newer version available">