[neon-notifications] Dev Required: libinput - 1.19.4

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_libinput/431/display/redirect

#<Debian::UScan::DEHS::Package:0x00007f5d500065e0 @name="libinput", @debian_uversion="1.19.3", @debian_mangled_uversion="1.19.3", @upstream_version="1.19.4", @upstream_url="http://www.freedesktop.org/software/libinput/libinput-1.19.4.tar.xz", @status="Newer version available">