[neon-notifications] Dev Required: qt6-grpc - 6.6.1

[Neon CI]

https://build.neon.kde.org/job/watcher_release_qt6_qt6-grpc/142/display/redirect

#<Debian::UScan::DEHS::Package:0x0000562bb5631aa0 @name="qt6-grpc", @debian_uversion="6.6.0", @debian_mangled_uversion="6.6.0", @upstream_version="6.6.1", @upstream_url="https://qt-mirror.dannhauer.de/official_releases/qt/6.6/6.6.1/submodules/qtgrpc-everywhere-src-6.6.1.tar.xz", @status="Newer version available">