submodule: bump openthread from `f09a70c` to `39fca69` (#165)
submodule: bump openthread from `f09a70c` to `39fca69` (#165)

Bumps [openthread](https://github.com/openthread/openthread) from `f09a70c` to `39fca69`.
- [Commits](https://github.com/openthread/openthread/compare/f09a70cfe1ea4a86e48d96b13752f5be3bc5cb4a...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-nrf528xx,openthread/ot-nrf528xx