community/weston: upgrade to 12.0.4

there is also 13.0.1 https://gitlab.freedesktop.org/wayland/weston/-/releases/

• 12.0.3 https://lists.freedesktop.org/archives/wayland-devel/2023-November/043327.html
• 12.0.4 https://lists.freedesktop.org/archives/wayland-devel/2024-April/043574.html
• 13.0.0 https://lists.freedesktop.org/archives/wayland-devel/2023-November/043326.html
• 13.0.1 https://lists.freedesktop.org/archives/wayland-devel/2024-April/043575.html