submodule: bump third_party/openthread/repo from f239c49 to 22fcb0e (#2093)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `f239c49` to `22fcb0e`.
- [Commits](openthread/openthread@f239c49...22fcb0e)

---
updated-dependencies:
- dependency-name: third_party/openthread/repo
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]