submodule: bump openthread from `6ef5534` to `39fca69` (#130)
submodule: bump openthread from `6ef5534` to `39fca69` (#130)

Bumps [openthread](https://github.com/openthread/openthread) from `6ef5534` to `39fca69`.
- [Commits](https://github.com/openthread/openthread/compare/6ef5534a51bee4717d48c5f44d40919ac392cee6...39fca696500e8dabbd30001cdbb868201360229c)

---
updated-dependencies:
- dependency-name: openthread
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-kw41z,openthread/ot-kw41z