submodule: bump openthread from `d346481` to `a24b67e` (#64)
submodule: bump openthread from `d346481` to `a24b67e` (#64)

Bumps [openthread](https://github.com/openthread/openthread) from `d346481` to `a24b67e`.
- [Commits](https://github.com/openthread/openthread/compare/d3464814948a457f33b2df3a02856ab2f3533a19...a24b67ef30af46496266a66fd5928ebb4e6955f0)

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

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-nrf528xx,openthread/ot-nrf528xx