submodule: bump openthread from `0a6a0b6` to `8967d62` (#17)
submodule: bump openthread from `0a6a0b6` to `8967d62` (#17)

Bumps [openthread](https://github.com/openthread/openthread) from `0a6a0b6` to `8967d62`.
- [Commits](https://github.com/openthread/openthread/compare/0a6a0b6604240e2476c2f1afbba82b2fa2a33575...8967d62ead1679c5cdd0e94e194826fee8f8f7b8)

---
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-b91,openthread/ot-b91