[neon-notifications] Releasing: kdegraphics-thumbnailers-5 - 26.04.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_neon-packaging_kdegraphics-thumbnailers-5/123/display/redirect

#<Debian::UScan::DEHS::Package:0x000070ba8d668740 @name="kdegraphics-thumbnailers-5", @debian_uversion="25.12.3", @debian_mangled_uversion="25.12.3", @upstream_version="26.04.0", @upstream_url="http://download.kde.internal.neon.kde.org/stable/release-service/26.04.0/src/kdegraphics-thumbnailers-26.04.0.tar.xz", @status="Newer version available">