submodule: bump openthread from `c9d68a7` to `09dd21a` (#155)
submodule: bump openthread from `c9d68a7` to `09dd21a` (#155)

Bumps [openthread](https://github.com/openthread/openthread) from `c9d68a7` to `09dd21a`.
- [Commits](https://github.com/openthread/openthread/compare/c9d68a7a012b5b4168f993bb79fbf6de61f0845f...09dd21abcad7f55e511ab71c8061c7145e2d5bd8)

---
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-qorvo,openthread/ot-qorvo,openthread/ot-qorvo