Bug#1026768: vulkan-loader: please consider packaging version 1.3.238

[Andrea Pappacoda]

Hi, sdk-1.3.239.0 has been tagged a few days ago, could you please look
into packaging it? If you need any help, feel free to ping me!

https://github.com/KhronosGroup/Vulkan-Loader/releases/tag/sdk-1.3.239.0