[neon-notifications] mbox-importer new version 19.04.1

[Neon CI]

https://build.neon.kde.org/job/watcher_release_kde_mbox-importer/373/display/redirect

#<Debian::UScan::DEHS::Package:0x0000556353965e68 @name="mbox-importer", @debian_uversion="19.04.0", @debian_mangled_uversion="19.04.0", @upstream_version="19.04.1", @upstream_url="http://download.kde.internal.neon.kde.org/stable/applications/19.04.1/src/mbox-importer-19.04.1.tar.xz", @status="Newer version available">