[neon-notifications] Releasing: kdiagram - 3.0.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_extras_kdiagram/797/display/redirect

#<Debian::UScan::DEHS::Package:0x000055ae2549e4a8 @name="kdiagram", @debian_uversion="2.8.0", @debian_mangled_uversion="2.8.0", @upstream_version="3.0.0", @upstream_url="http://download.kde.internal.neon.kde.org/stable/kdiagram/3.0.0/kdiagram-3.0.0.tar.xz", @status="Newer version available">