[neon-notifications] Releasing: kstars - 3.6.4

[Neon CI]

https://build.neon.kde.org/job/watcher_release_extras_kstars/566/display/redirect

#<Debian::UScan::DEHS::Package:0x0000563eb73efc00 @name="kstars", @debian_uversion="3.6.3", @debian_mangled_uversion="3.6.3", @upstream_version="3.6.4", @upstream_url="https://download.kde.internal.neon.kde.org/stable/kstars/kstars-3.6.4.tar.xz", @status="Newer version available">