[neon-notifications] Dev Required: qxmpp - 1.8.1

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-jammy_qxmpp-jammy/54/display/redirect

#<Debian::UScan::DEHS::Package:0x00007feb5a81bf30 @name="qxmpp", @debian_uversion="1.6.0", @debian_mangled_uversion="1.6.0", @upstream_version="1.8.1", @upstream_url="https://github.com/qxmpp-project/qxmpp/archive/refs/tags/v1.8.1.tar.gz", @status="Newer version available">