submodule: bump openthread from `a04a68b` to `a3edc4f` (#216)
submodule: bump openthread from `a04a68b` to `a3edc4f` (#216)

Bumps [openthread](https://github.com/openthread/openthread) from `a04a68b` to `a3edc4f`.
- [Commits](https://github.com/openthread/openthread/compare/a04a68b51b26d7c850b76a408d1e107f5d35934e...a3edc4fcabf9ac4d75c6335a5bbfe5a5ea3e5abc)

---
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-efr32,openthread/ot-efr32,openthread/ot-efr32