[neon-notifications] Dev Required: pipewire - 0.3.29

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_pipewire/188/display/redirect

#<Debian::UScan::DEHS::Package:0x0000559a16604720 @name="pipewire", @debian_uversion="0.3.28", @debian_mangled_uversion="0.3.28", @upstream_version="0.3.29", @upstream_url="https://github.com/PipeWire/pipewire/archive/refs/tags/0.3.29.tar.gz", @status="Newer version available">