[neon-notifications] kdiff3 new version 1.8.2

[Neon CI]

https://build.neon.kde.org/job/watcher_release_extras_kdiff3/191/display/redirect

#<Debian::UScan::DEHS::Package:0x0000564ca5a6b6a0 @name="kdiff3", @debian_uversion="1.8.1", @debian_mangled_uversion="1.8.1", @upstream_version="1.8.2", @upstream_url="http://download.kde.internal.neon.kde.org/stable/kdiff3/kdiff3-1.8.2.tar.xz", @status="Newer version available">