mesa: Upgrade 25.1.5 -> 25.1.6

mesa: Upgrade 25.1.5 -> 25.1.6

- v3dv: regression in vkAllocateMemory importing gbm bo
- Vulkan WSI (and zink) use threads on X11 even when the X
  connection isn't thread-safe
- sddm-greeter-qt segfault when using nvk+zink
- [regression][bisected] [FirePro W4100]: crashing/rebooting
- Descriptor set layout with binding flags fails due to indices
  not matching bindings
- piglit bindless texture tests crash
- [radeonsi] Artifacts in Team Fortress 2 (bisected)
- eglgears_wayland segfault on zink+nvk with PRIME
- vn_renderer_virtgpu.c:13:10: fatal error: 'xf86drm.h' file not
  found
- brw: mad instruction printing broken on Gfx11
- radv: RGB9E5 rendering does not ignore alpha write mask

Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>