[neon-notifications] Dev Required: pipewire - 0.3.50

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_pipewire/214/display/redirect

#<Debian::UScan::DEHS::Package:0x000055933cad0f28 @name="pipewire", @debian_uversion="0.3.38", @debian_mangled_uversion="0.3.38", @upstream_version="0.3.50", @upstream_url="https://gitlab.freedesktop.org/pipewire/pipewire/-/archive/0.3.50/pipewire-0.3.50.tar.bz2", @status="Newer version available">