submodule: bump openthread from `0e8b660` to `cf4b71d` (#165)
submodule: bump openthread from `0e8b660` to `cf4b71d` (#165)

Bumps [openthread](https://github.com/openthread/openthread) from `0e8b660` to `cf4b71d`.
- [Commits](https://github.com/openthread/openthread/compare/0e8b6604cb256cef828a0ebb37bdd031cdf0677d...cf4b71d8b90122f753486215557af46b25bc2185)

---
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-samr21,openthread/ot-samr21