submodule: bump openthread from `713231e` to `4ff5ab6` (#48)
submodule: bump openthread from `713231e` to `4ff5ab6` (#48)

Bumps [openthread](https://github.com/openthread/openthread) from `713231e` to `4ff5ab6`.
- [Commits](https://github.com/openthread/openthread/compare/713231e144c9ccd46126323fb14d2ab06cdb6361...4ff5ab67d7cd6a6cbd28d55ed4e244fb9c3b8833)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-qorvo,openthread/ot-qorvo,openthread/ot-qorvo