[neon-notifications] kdegraphics-thumbnailers new version 19.04.1

[Neon CI]

https://build.neon.kde.org/job/watcher_release_kde_kdegraphics-thumbnailers/378/display/redirect

#<Debian::UScan::DEHS::Package:0x0000564fbdfe9a58 @name="kdegraphics-thumbnailers", @debian_uversion="19.04.0", @debian_mangled_uversion="19.04.0", @upstream_version="19.04.1", @upstream_url="https://download.kde.internal.neon.kde.org/stable/applications/19.04.1/src/kdegraphics-thumbnailers-19.04.1.tar.xz", @status="Newer version available">