[neon-notifications] Dev Required: litehtml - 0.6

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_litehtml/331/display/redirect

#<Debian::UScan::DEHS::Package:0x00005573c6e393f8 @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">