submodule: bump openthread from 922059c to ee83d45

Bumps [openthread](https://github.com/openthread/openthread) from `922059c` to `ee83d45`.
- [Release notes](https://github.com/openthread/openthread/releases)
- [Commits](openthread/openthread@922059c...ee83d45)

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

Signed-off-by: dependabot[bot] <[email protected]>