[neon-notifications] Dev Required: qt6-serialbus - 6.9.1

[Neon CI]

https://build.neon.kde.org/job/watcher_release_qt6_qt6-serialbus/294/display/redirect

#<Debian::UScan::DEHS::Package:0x00007ef610c3d770 @name="qt6-serialbus", @debian_uversion="6.9.0", @debian_mangled_uversion="6.9.0", @upstream_version="6.9.1", @upstream_url="https://qt-mirror.dannhauer.de/official_releases/qt/6.9/6.9.1/submodules/qtserialbus-everywhere-src-6.9.1.tar.xz", @status="Newer version available">