[neon-notifications] Dev Required: libgwenhywfar - 5.7.3

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_libgwenhywfar/4/display/redirect

#<Debian::UScan::DEHS::Package:0x0000563478cacd50 @name="libgwenhywfar", @debian_uversion="5.6.0", @debian_mangled_uversion="5.6.0", @upstream_version="5.7.3", @upstream_url="https://www.aquamaniac.de/rdm/attachments/download/390/gwenhywfar-5.7.3.tar.gz", @status="Newer version available">