Overview of Changes in 4.12.3, 28-09-2023
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* GtkWindow:
 - Don't assume titlebars are GtkHeaderBar

* GtkTreeView:
 - Fix a crash in gtk_tree_view_is_blank_at_pos

* printing:
 - Fix some issues with the portal implementation

* GSK:
 - Some optimizations in the GL renderer
 - Fix memory leaks in the Broadway renderer

* demos:
 - Fix a crash in gtk4-demo

* Translation updates
 Basque
 Brazilian Portuguese
 Czech
 Galician
 Georgian
 German
 Hungarian
 Kazakh
 Lithuanian
 Persian
 Polish
 Spanish
 Swedish
 Turkish