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](https://github.com/jbeder/yaml-cpp/compare/73ef0060aaa1a9dc742c1d8a36fa336b35e94035...39f737443b05e4135e697cb91c2b7b18095acd53)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/third_party/yaml-cpp b/third_party/yaml-cpp
index 73ef006..39f7374 160000
--- a/third_party/yaml-cpp
+++ b/third_party/yaml-cpp
@@ -1 +1 @@
-Subproject commit 73ef0060aaa1a9dc742c1d8a36fa336b35e94035
+Subproject commit 39f737443b05e4135e697cb91c2b7b18095acd53