[neon-notifications] Dev Required: libseccomp - 2.5.4

[Neon CI]

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

#<Debian::UScan::DEHS::Package:0x0000556c770e4e60 @name="libseccomp", @debian_uversion="2.5.3", @debian_mangled_uversion="2.5.3", @upstream_version="2.5.4", @upstream_url="https://github.com/seccomp/libseccomp/releases/download/v2.5.4/libseccomp-2.5.4.tar.gz", @status="Newer version available">