flatpak: Use "gnome-3-34" branch for gnome-bluetooth
gnome-bluetooth got its API version bumped for the GTK4 port. Let's pin the old stable version for now (until g-c-c ports to GTK4).
This is a follow up on !1094 (merged).
gnome-bluetooth got its API version bumped for the GTK4 port. Let's pin the old stable version for now (until g-c-c ports to GTK4).
This is a follow up on !1094 (merged).