[neon-notifications] skrooge new version 2.21.1

[Neon CI]

https://build.neon.kde.org/job/watcher_release_extras_skrooge/562/display/redirect

#<Debian::UScan::DEHS::Package:0x00005565fdf17558 @name="skrooge", @debian_uversion="2.20.0", @debian_mangled_uversion="2.20.0", @upstream_version="2.21.1", @upstream_url="http://download.kde.internal.neon.kde.org/stable/skrooge/skrooge-2.21.1.tar.xz", @status="Newer version available">