submodule: bump third_party/openthread/repo from `5d50088` to `ccf8ea6` (#1526)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `5d50088` to `ccf8ea6`.
- [Commits](https://github.com/openthread/openthread/compare/5d50088da92fdb191ca2ee67a7720cadf6128e36...ccf8ea69230bf474cbcd61ef61fc5519df7665dd)

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

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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 5d50088..ccf8ea6 160000
--- a/third_party/openthread/repo
+++ b/third_party/openthread/repo
@@ -1 +1 @@
-Subproject commit 5d50088da92fdb191ca2ee67a7720cadf6128e36
+Subproject commit ccf8ea69230bf474cbcd61ef61fc5519df7665dd