[neon-notifications] Dev Required: harfbuzz - 8.4.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-jammy_harfbuzz/418/display/redirect

#<Debian::UScan::DEHS::Package:0x00007f83d835dcd0 @name="harfbuzz", @debian_uversion="8.0.1", @debian_mangled_uversion="8.0.1", @upstream_version="8.4.0", @upstream_url="https://github.com/harfbuzz/harfbuzz/releases/download/8.4.0/harfbuzz-8.4.0.tar.xz", @status="Newer version available">