build(deps): bump third_party/yaml-cpp from 73ef006 to 39f7374 (#…

…2490)

Bumps [third_party/yaml-cpp](https://github.com/jbeder/yaml-cpp) from `73ef006` to `39f7374`.
- [Release notes](https://github.com/jbeder/yaml-cpp/releases)
- [Commits](jbeder/yaml-cpp@73ef006...39f7374)

---
updated-dependencies:
- dependency-name: third_party/yaml-cpp
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>