submodule: bump openthread from `a193a6f` to `0a6fba3` (#118)
submodule: bump openthread from `a193a6f` to `0a6fba3` (#118)

Bumps [openthread](https://github.com/openthread/openthread) from `a193a6f` to `0a6fba3`.
- [Commits](https://github.com/openthread/openthread/compare/a193a6f23a70fd2413538d251328eb027dcb5cf3...0a6fba303aa78310461b83209a2f959db3456647)

---
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