[neon-notifications] Releasing: cantor - 21.08.2

[Neon CI]

https://build.neon.kde.org/job/watcher_release_kde_cantor/14/display/redirect

#<Debian::UScan::DEHS::Package:0x00005622cec7c6e8 @name="cantor", @debian_uversion="21.08.1", @debian_mangled_uversion="21.08.1", @upstream_version="21.08.2", @upstream_url="http://download.kde.internal.neon.kde.org/stable/release-service/21.08.2/src/cantor-21.08.2.tar.xz", @status="Newer version available">