gtk4: upgrade 4.16.7 -> 4.16.12

gtk4: upgrade 4.16.7 -> 4.16.12

Changelog:
==========
* GtkFileChooser:
 - Fix a focus problem with the server entry

* GtkEmojiChooser:
 - Update to CLDR 46 / Unicode 16

* GtkAboutDialog:
 - Small improvements

* Wayland:
 - Fix some Vulkan sizing corner cases
 - Fix problems with rotated, offloaded images
 - Fix a few crashes

* Demos:
 - Don't create extra windows for D-Bus activation

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>