[neon-notifications] Releasing: alligator - 21.12

[Neon CI]

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

#<Debian::UScan::DEHS::Package:0x000055cc0afd9248 @name="alligator", @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/alligator-21.12.tar.xz", @status="Newer version available">