graphics/vulkan-headers: update to 1.2.191

Force rebuild vulkan-loader to make sure vulkaninfo shows the new version.

Changes: https://github.com/KhronosGroup/Vulkan-Headers/compare/v1.2.190...v1.2.191
Reported by: portscout

(cherry picked from commit 666df58471f88dcc57cabc4c0b18304df70d1c6c)