[neon-notifications] Dev Required: libsdl2 - 2.30.6

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-jammy_libsdl2/3/display/redirect

#<Debian::UScan::DEHS::Package:0x00007f7a1930d7f8 @name="libsdl2", @debian_uversion="2.30.2", @debian_mangled_uversion="2.30.2", @upstream_version="2.30.6", @upstream_url="https://github.com/libsdl-org/SDL/releases/download/release-2.30.6/SDL2-2.30.6.tar.gz", @status="Newer version available">