build(deps): bump third-party/FFmpeg/Vulkan-Headers from 11d6898 to f9973cd (#750)

build(deps): bump third-party/FFmpeg/Vulkan-Headers

Bumps [third-party/FFmpeg/Vulkan-Headers](https://github.com/KhronosGroup/Vulkan-Headers) from `11d6898` to `f9973cd`.
- [Commits](KhronosGroup/Vulkan-Headers@11d6898...f9973cd)

---
updated-dependencies:
- dependency-name: third-party/FFmpeg/Vulkan-Headers
  dependency-version: f9973cd97e6f3584707e7ef1c425e336f1b92a5b
  dependency-type: direct:production
...

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Author: dependabot[bot]