[neon-notifications] Releasing: kdiff3 - 1.9.1

[Neon CI]

https://build.neon.kde.org/job/watcher_release_extras_kdiff3/602/display/redirect

#<Debian::UScan::DEHS::Package:0x000055d9ab6e2758 @name="kdiff3", @debian_uversion="1.9.0", @debian_mangled_uversion="1.9.0", @upstream_version="1.9.1", @upstream_url="https://download.kde.internal.neon.kde.org/stable/kdiff3/kdiff3-1.9.1.tar.xz", @status="Newer version available">