[neon-notifications] Dev Required: pipewire - 1.6.4

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-noble_pipewire-noble/475/display/redirect

#<Debian::UScan::DEHS::Package:0x00007be6caff6bf8 @name="pipewire", @debian_uversion="1.2.6", @debian_mangled_uversion="1.2.6", @upstream_version="1.6.4", @upstream_url="https://gitlab.freedesktop.org/pipewire/pipewire/-/archive/1.6.4/pipewire-1.6.4.tar.bz2", @status="Newer version available">