submodule: bump third_party/openthread/repo from `8467a3d` to `f434479` (#808)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `8467a3d` to `f434479`.
- [Commits](https://github.com/openthread/openthread/compare/8467a3d5223c274b65a71080f6aad94dc182a9bb...f4344792dafc2c11162e68062e32b4be433055ad)

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 8467a3d..f434479 160000
--- a/third_party/openthread/repo
+++ b/third_party/openthread/repo
@@ -1 +1 @@
-Subproject commit 8467a3d5223c274b65a71080f6aad94dc182a9bb
+Subproject commit f4344792dafc2c11162e68062e32b4be433055ad