submodule: bump openthread from 05c6234 to 9e9522a (#935)

Bumps [openthread](https://github.com/openthread/openthread) from `05c6234` to `9e9522a`.
- [Commits](openthread/openthread@05c6234...9e9522a)

---
updated-dependencies:
- dependency-name: openthread
  dependency-version: 9e9522aaacb691c3157ff47577f3a4cb5df815e2
  dependency-type: direct:production
...

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