submodule: bump openthread from 76db9df to 01006d2 (#1372)

Bumps [openthread](https://github.com/openthread/openthread) from `76db9df` to `01006d2`.
- [Commits](openthread/openthread@76db9df...01006d2)

---
updated-dependencies:
- dependency-name: openthread
  dependency-version: 01006d241f214d422d3bbfc6f9795e59cf7f4535
  dependency-type: direct:production
...

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