Bump 3rdparty/vcpkg from c4467cb to 509f71e

Bumps [3rdparty/vcpkg](https://github.com/microsoft/vcpkg) from `c4467cb` to `509f71e`.
- [Release notes](https://github.com/microsoft/vcpkg/releases)
- [Commits](microsoft/vcpkg@c4467cb...509f71e)

---
updated-dependencies:
- dependency-name: 3rdparty/vcpkg
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>