submodule: bump openthread from `512d072` to `282b85f` (#271)
submodule: bump openthread from `512d072` to `282b85f` (#271)

Bumps [openthread](https://github.com/openthread/openthread) from `512d072` to `282b85f`.
- [Commits](https://github.com/openthread/openthread/compare/512d0728895641061d25dbbc545f0256d3535865...282b85fa9cbed26bd9957e45cf0ac4eefb62c024)

---
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-cc2538,openthread/ot-cc2538