submodule: bump third_party/openthread/repo from `bd63637` to `c6eaeda` (#2051)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `bd63637` to `c6eaeda`.
- [Commits](https://github.com/openthread/openthread/compare/bd636376963b1998b75fbd74e06575bcce4b89cc...c6eaeda5a1c1c5dbb24dce7e027340cb8893a77b)

---
updated-dependencies:
- dependency-name: third_party/openthread/repo
  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/openthread/repo b/third_party/openthread/repo
index bd63637..c6eaeda 160000
--- a/third_party/openthread/repo
+++ b/third_party/openthread/repo
@@ -1 +1 @@
-Subproject commit bd636376963b1998b75fbd74e06575bcce4b89cc
+Subproject commit c6eaeda5a1c1c5dbb24dce7e027340cb8893a77b