[neon-notifications] Releasing: kwin-selenium - 6.6.4

[Neon CI]

https://build.neon.kde.org/job/watcher_release_neon-packaging_kwin-selenium-tester/161/display/redirect

#<Debian::UScan::DEHS::Package:0x00007c47352382c0 @name="kwin-selenium", @debian_uversion="6.6.3", @debian_mangled_uversion="6.6.3", @upstream_version="6.6.4", @upstream_url="https://download.kde.internal.neon.kde.org/stable/plasma/6.6.4/kwin-6.6.4.tar.xz", @status="Newer version available">