temp/gtk4.0: upgrade to 4.6.4

Upstream MR: https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/34721

NEWS:

* GtkFileChooser:
 - Fix select button sensitivity in select_folder mode
 - Fix some fallout from list model porting

* GtkListView, GtkColumnView:
 - Optimize scrolling

* print-to-file:
 - Handle nonexisting files better in the dialog

* Avoid infinite loops in size allocation

* CSS:
 - Optimize a case of reparenting that is important in GtkListView

* GSK:
 - Check for half-float support before using it

* Wayland:
 - Ignore empty preedit updates This fixes a problem with
   textview scrolling
 - Freeze popups when hidden. This addresses a frame rate drop

* Translation updates
 Hebrew
 Nepali

This is mostly maintenance, and looks uncontroversial. Would be great if we could get it merged pretty fast to avoid diff with alpine.