[neon-notifications] Releasing: kdiff3 - 1.12.3

[Neon CI]

https://build.neon.kde.org/job/watcher_release_extras_kdiff3/272/display/redirect

#<Debian::UScan::DEHS::Package:0x000079b2b5c44ca8 @name="kdiff3", @debian_uversion="1.12.2", @debian_mangled_uversion="1.12.2", @upstream_version="1.12.3", @upstream_url="https://download.kde.internal.neon.kde.org/stable/kdiff3/kdiff3-1.12.3.tar.xz", @status="Newer version available">