[neon-notifications] Releasing: koko - 21.12

[Neon CI]

https://build.neon.kde.org/job/watcher_release_mobile_koko/75/display/redirect

#<Debian::UScan::DEHS::Package:0x0000561a932457f8 @name="koko", @debian_uversion="21.08", @debian_mangled_uversion="21.08", @upstream_version="21.12", @upstream_url="http://download.kde.internal.neon.kde.org/stable/plasma-mobile/21.12/koko-21.12.tar.xz", @status="Newer version available">