build(deps): bump third_party/yaml-cpp from `84459a7` to `d45c4fb` (#2469)

Bumps [third_party/yaml-cpp](https://github.com/jbeder/yaml-cpp) from `84459a7` to `d45c4fb`.
- [Release notes](https://github.com/jbeder/yaml-cpp/releases)
- [Commits](https://github.com/jbeder/yaml-cpp/compare/84459a7f982ea4d10e943237b2e9c71afdab6a45...d45c4fba3eccb318441ceeccca67345b0dd21a80)

---
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 84459a7..d45c4fb 160000
--- a/third_party/yaml-cpp
+++ b/third_party/yaml-cpp
@@ -1 +1 @@
-Subproject commit 84459a7f982ea4d10e943237b2e9c71afdab6a45
+Subproject commit d45c4fba3eccb318441ceeccca67345b0dd21a80