build(deps): bump third_party/yaml-cpp from `39f7374` to `2f86d13`

Bumps [third_party/yaml-cpp](https://github.com/jbeder/yaml-cpp) from `39f7374` to `2f86d13`.
- [Release notes](https://github.com/jbeder/yaml-cpp/releases)
- [Commits](https://github.com/jbeder/yaml-cpp/compare/39f737443b05e4135e697cb91c2b7b18095acd53...2f86d13775d119edbb69af52e5f566fd65c6953b)

---
updated-dependencies:
- dependency-name: third_party/yaml-cpp
  dependency-version: 2f86d13775d119edbb69af52e5f566fd65c6953b
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

third_party/yaml-cpp

diff --git a/third_party/yaml-cpp b/third_party/yaml-cpp
index 39f7374..2f86d13 160000
--- a/third_party/yaml-cpp
+++ b/third_party/yaml-cpp
@@ -1 +1 @@
-Subproject commit 39f737443b05e4135e697cb91c2b7b18095acd53
+Subproject commit 2f86d13775d119edbb69af52e5f566fd65c6953b