submodule: bump third_party/openthread/repo from `4b455ca` to `5b6654d` (#833)
submodule: bump third_party/openthread/repo from `4b455ca` to `5b6654d` (#833)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `4b455ca` to `5b6654d`.
- [Commits](https://github.com/openthread/openthread/compare/4b455ca72c9836a7ca9d32d6bf6f09666ec18084...5b6654d0bccaad436193a08a79a545e8a22b64a0)

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

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