gtk4: update 4.18.3 -> 4.18.4

gtk4: update 4.18.3 -> 4.18.4

Overview of Changes in 4.18.4, 06-04-2025
=========================================

* Bugs fixed:
  - #7447 4.18.3 regression: cursor doesn't update state when crossing window
    boundaries (Matthias Clasen)
  - #7459 Gtk.Video causes segfault inside VM with wayland backend (Matthias
    Clasen)
  - #7466 Win32: can't resize or move windows anymore (Matthias Clasen)
  - !8375 testsuite: Make reftest-compare use gsize instead of int (Benjamin
    Otte)
  - !8378 wayland: Force setting cursor on enter
  - !8394 wayland: Force setting cursor on enter
  - !8400 Merge fixes from !8375 into 4.18
  - !8403 inspector: Survive without installed schemas
  - !8408 builder: Fix a menu parsing issue
  - !8422 win32: Fix initial window state
  - !8429 vulkan: Do not create dmabuf target images if not enabled

* Translation updates:
  - Bulgarian (Alexander Shopov)
  - Chinese (China) (Luming Zh)
  - Czech (Daniel Rusek)
  - Georgian (Ekaterine Papava)
  - Lithuanian (Aurimas Černius)
  - Persian (Danial Behzadi)
  - Portuguese (Hugo Carvalho)
  - Slovenian (Martin)
  - Turkish (Emin Tufan Çetin)
  - Ukrainian (Yuri Chornoivan)

Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>