[neon-notifications] Releasing: kwin-selenium - 6.7.3

[Neon CI]

https://build.neon.kde.org/job/watcher_release_plasma_kwin-selenium-tester/246/display/redirect

#<Debian::UScan::DEHS::Package:0x000075efa4b97f80 @name="kwin-selenium", @debian_uversion="6.7.2", @debian_mangled_uversion="6.7.2", @upstream_version="6.7.3", @upstream_url="https://download.kde.internal.neon.kde.org/stable/plasma/6.7.3/kwin-6.7.3.tar.xz", @status="Newer version available">