submodule: bump openthread from 37144f0 to d099d78 (#713)

Bumps [openthread](https://github.com/openthread/openthread) from `37144f0` to `d099d78`.
- [Commits](openthread/openthread@37144f0...d099d78)

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

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