submodule: bump openthread from `4e8eecc` to `600ae09` (#320)
submodule: bump openthread from `4e8eecc` to `600ae09` (#320)

Bumps [openthread](https://github.com/openthread/openthread) from `4e8eecc` to `600ae09`.
- [Commits](https://github.com/openthread/openthread/compare/4e8eeccfe8f7c1e50f8de729a92228d54c5608aa...600ae0999450f3fadcf1134a2f87972de37f48c2)

---
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-samr21,openthread/ot-samr21