[neon-notifications] Dev Required: litehtml - 0.6

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_litehtml/315/display/redirect

#<Debian::UScan::DEHS::Package:0x0000558e40f353d0 @name="litehtml", @debian_uversion="0.5", @debian_mangled_uversion="0.5", @upstream_version="0.6", @upstream_url="https://github.com/litehtml/litehtml/archive/refs/tags/v0.6.tar.gz", @status="Newer version available">