submodule: bump openthread from `0756d1e` to `2cab708` (#346)
submodule: bump openthread from `0756d1e` to `2cab708` (#346)

Bumps [openthread](https://github.com/openthread/openthread) from `0756d1e` to `2cab708`.
- [Commits](https://github.com/openthread/openthread/compare/0756d1ea8fee17eba0cdee42a34ea353413a4f99...2cab708443ece91555a9ba6d238b5908506ac409)

---
updated-dependencies:
- dependency-name: openthread
  dependency-type: direct:production
...

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-cc13x2-cc26x2,openthread/ot-cc13x2-cc26x2