submodule: bump openthread from `adf4e84` to `9fcdbed` (#258)
submodule: bump openthread from `adf4e84` to `9fcdbed` (#258)

Bumps [openthread](https://github.com/openthread/openthread) from `adf4e84` to `9fcdbed`.
- [Commits](https://github.com/openthread/openthread/compare/adf4e84caf71b63f3026640fdd31055daf1e27e8...9fcdbed9c526c70f1556d1ed84099c1535c7cd32)

---
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