Update the vulkan-headers commit SHA

[mattmoor]

When I build this locally I see:

⚠️  aarch64   | Cloning into '/tmp/tmp.3RiQTf'...
⚠️  aarch64   | Note: switching to '485c0395ad85bcefe7aed17d23362d93f61f942d'.
⚠️  aarch64   | 
⚠️  aarch64   | You are in 'detached HEAD' state. You can look around, make experimental
⚠️  aarch64   | changes and commit them, and you can discard any commits you make in this
⚠️  aarch64   | state without impacting any branches by switching back to a branch.
⚠️  aarch64   | 
⚠️  aarch64   | If you want to create a new branch to retain commits you create, you may
⚠️  aarch64   | do so (now or later) by using -c with the switch command. Example:
⚠️  aarch64   | 
⚠️  aarch64   |   git switch -c <new-branch-name>
⚠️  aarch64   | 
⚠️  aarch64   | Or undo this operation with:
⚠️  aarch64   | 
⚠️  aarch64   |   git switch -
⚠️  aarch64   | 
⚠️  aarch64   | Turn off this advice by setting config variable advice.detachedHead to false
⚠️  aarch64   | 
ℹ️  aarch64   | Error (git-checkout): expect commit 195c58410f9c6ee9f1c6a9e56bbaaa614947d5bf, got 485c0395ad85bcefe7aed17d23362d93f61f942d

Looking at the upstream repo, the commit we are getting appears to be what's published:

[mattmoor]

The aarch64 build with this change completed locally for me