submodule: bump openthread from `54d848e` to `686c0de` (#182)
submodule: bump openthread from `54d848e` to `686c0de` (#182)

Bumps [openthread](https://github.com/openthread/openthread) from `54d848e` to `686c0de`.
- [Commits](https://github.com/openthread/openthread/compare/54d848e11bc83ff28710abc7aff21a8dc6787510...686c0de5fa79d5afe5b3128fabdb61e05610607d)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-qorvo,openthread/ot-qorvo,openthread/ot-qorvo