submodule: bump openthread from 193e77e to 22fcb0e

Bumps [openthread](https://github.com/openthread/openthread) from `193e77e` to `22fcb0e`.
- [Release notes](https://github.com/openthread/openthread/releases)
- [Commits](openthread/openthread@193e77e...22fcb0e)

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

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