subprojects/shew: Adjust to GTK deprecation

Merged Florian Müllner requested to merge fmuellner/gnome-shell:gtk-deprecation into main

GTK 4.12 deprecates gdk_wayland_toplevel_unexport_handle() in favor of the new gdk_wayland_toplevel_drop_exported_handle(). We are not bound by API stability, so we can just expose the additional argument that the replacement requires instead of tracking the handle internally.

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