build(deps): bump third_party/yaml-cpp from `13626af` to `420c982` (#1919)

Bumps [third_party/yaml-cpp](https://github.com/jbeder/yaml-cpp) from `13626af` to `420c982`.
- [Release notes](https://github.com/jbeder/yaml-cpp/releases)
- [Commits](https://github.com/jbeder/yaml-cpp/compare/13626af92af7642eba79837842c59602201d52a1...420c98231094b1cd2e5de3a714c4e3ee9b4f1118)

---
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>

third_party/yaml-cpp

diff --git a/third_party/yaml-cpp b/third_party/yaml-cpp
index 13626af..420c982 160000
--- a/third_party/yaml-cpp
+++ b/third_party/yaml-cpp
@@ -1 +1 @@
-Subproject commit 13626af92af7642eba79837842c59602201d52a1
+Subproject commit 420c98231094b1cd2e5de3a714c4e3ee9b4f1118