[neon-notifications] Releasing: angelfish - 21.08

[Neon CI]

https://build.neon.kde.org/job/watcher_release_mobile_angelfish/100/display/redirect

#<Debian::UScan::DEHS::Package:0x000055dd8c70b2e0 @name="angelfish", @debian_uversion="21.07", @debian_mangled_uversion="21.07", @upstream_version="21.08", @upstream_url="http://download.kde.internal.neon.kde.org/stable/plasma-mobile/21.08/angelfish-21.08.tar.xz", @status="Newer version available">