gvc: Update submodule to up-to-date version
This frees us from all remaining '‘g_type_class_add_private’ is deprecated' warnings. https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/427
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This frees us from all remaining '‘g_type_class_add_private’ is deprecated' warnings. https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/427