[neon-notifications] Dev Required: qt6-languageserver - 6.9.3

[Neon CI]

https://build.neon.kde.org/job/watcher_release_qt6_qt6-languageserver/406/display/redirect

#<Debian::UScan::DEHS::Package:0x00007ab2c072a7e8 @name="qt6-languageserver", @debian_uversion="6.9.2", @debian_mangled_uversion="6.9.2", @upstream_version="6.9.3", @upstream_url="https://qt-mirror.dannhauer.de/official_releases/qt/6.9/6.9.3/submodules/qtlanguageserver-everywhere-src-6.9.3.tar.xz", @status="Newer version available">