submodule: bump openthread from `866c960` to `ba4a447` (#123)
submodule: bump openthread from `866c960` to `ba4a447` (#123)

Bumps [openthread](https://github.com/openthread/openthread) from `866c960` to `ba4a447`.
- [Commits](https://github.com/openthread/openthread/compare/866c9602fb8f8611204823077001ab571b7b43a0...ba4a44713fb8ff6a1304a50cb990d14f98674275)

---
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