submodule: bump third_party/openthread/repo from 6edb06e to `0f55e7…

…9` (#2091)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `6edb06e` to `0f55e79`.
- [Commits](openthread/openthread@6edb06e...0f55e79)

---
updated-dependencies:
- dependency-name: third_party/openthread/repo
  dependency-type: direct:production
...

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