submodule: bump openthread from 5f03f0e to 3bc82a9 (#1148)

Bumps [openthread](https://github.com/openthread/openthread) from `5f03f0e` to `3bc82a9`.
- [Commits](openthread/openthread@5f03f0e...3bc82a9)

---
updated-dependencies:
- dependency-name: openthread
  dependency-version: 3bc82a966b8ad85a0cd50cbe0df720f044460e50
  dependency-type: direct:production
...

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Author: dependabot[bot]