community/mutter: use gtk4.0
since 44.rc it was merged https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2864
ref #13931 (closed) and !45096 (merged)
since 44.rc it was merged https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2864
ref #13931 (closed) and !45096 (merged)