[neon-notifications] labplot new version 2.6

[Neon CI]

https://build.neon.kde.org/job/watcher_release_extras_labplot/658/display/redirect

#<Debian::UScan::DEHS::Package:0x000055a5219cb780 @name="labplot", @debian_uversion="2.5.0", @debian_mangled_uversion="2.5.0", @upstream_version="2.6", @upstream_url="http://download.kde.internal.neon.kde.org/stable/labplot/2.6.0/labplot-2.6.tar.xz", @status="Newer version available">