update to latest vulkan-zig version (helps hexops/mach#1276)

Signed-off-by: Stephen Gutekanst <[email protected]>

update.sh

@@ -21,7 +21,7 @@ mkdir vulkan-zig/
 pushd vulkan-zig
 git init
 git remote add origin https://github.com/Snektron/vulkan-zig
-git fetch --depth 1 origin cfaf58a4de0d876d37d6dd9a05a5060e4f9b7cd9
+git fetch --depth 1 origin 06dae6c9201863837a92064e2e7814aa71064067
 git checkout FETCH_HEAD
 popd