[neon-notifications] Releasing: digikam - 8.4.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_neon-packaging_digikam/1019/display/redirect

#<Debian::UScan::DEHS::Package:0x00007f6208d3d828 @name="digikam", @debian_uversion="8.3.0", @debian_mangled_uversion="8.3.0", @upstream_version="8.4.0", @upstream_url="https://download.kde.internal.neon.kde.org/stable/digikam/8.4.0/digiKam-8.4.0.tar.xz", @status="Newer version available">