[neon-notifications] Releasing: shelf - 3.1.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_neon-packaging_shelf/264/display/redirect

#<Debian::UScan::DEHS::Package:0x0000564c7fb8e328 @name="shelf", @debian_uversion="3.0.2", @debian_mangled_uversion="3.0.2", @upstream_version="3.1.0", @upstream_url="http://download.kde.internal.neon.kde.org/stable/maui/shelf/3.1.0/shelf-3.1.0.tar.xz", @status="Newer version available">