graphics/vulkan-headers: update to 1.3.277

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

Changes: https://github.com/KhronosGroup/Vulkan-Headers/compare/v1.3.276...v1.3.277
See also: https://www.khronos.org/blog/khronos-releases-vulkan-video-av1-decode-extension-vulkan-sdk-now-supports-h.264-h.265-encode
Reported by: Repology, portscout