submodule: bump openthread from `ed4dcea` to `09dd21a` (#96)
submodule: bump openthread from `ed4dcea` to `09dd21a` (#96)

Bumps [openthread](https://github.com/openthread/openthread) from `ed4dcea` to `09dd21a`.
- [Commits](https://github.com/openthread/openthread/compare/ed4dceaa6d263045277acd6c35ecae45e416c5ab...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-b91,openthread/ot-b91