submodule: bump third_party/openthread/repo from `13df037` to `cc8e4cc` (#1546)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `13df037` to `cc8e4cc`.
- [Commits](https://github.com/openthread/openthread/compare/13df0374d11306e557f7949bb027f4778eedde62...cc8e4cce158357d5a5a979f235083a4667fc74d7)

---
updated-dependencies:
- dependency-name: third_party/openthread/repo
  dependency-type: direct:production
...

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

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 13df037..cc8e4cc 160000
--- a/third_party/openthread/repo
+++ b/third_party/openthread/repo
@@ -1 +1 @@
-Subproject commit 13df0374d11306e557f7949bb027f4778eedde62
+Subproject commit cc8e4cce158357d5a5a979f235083a4667fc74d7