submodule: bump openthread from 1fb1d9a to 0e36799 (#694)

Bumps [openthread](https://github.com/openthread/openthread) from `1fb1d9a` to `0e36799`.
- [Commits](openthread/openthread@1fb1d9a...0e36799)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>