[neon-notifications] Dev Required: qxmpp - 1.9.4

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-noble_qxmpp-noble/193/display/redirect

#<Debian::UScan::DEHS::Package:0x00007641396e2e90 @name="qxmpp", @debian_uversion="1.9.0", @debian_mangled_uversion="1.9.0", @upstream_version="1.9.4", @upstream_url="https://github.com/qxmpp-project/qxmpp/archive/refs/tags/v1.9.4.tar.gz", @status="Newer version available">