submodule: bump openthread from `2615d10` to `4ce6a47` (#319)
submodule: bump openthread from `2615d10` to `4ce6a47` (#319)

Bumps [openthread](https://github.com/openthread/openthread) from `2615d10` to `4ce6a47`.
- [Commits](https://github.com/openthread/openthread/compare/2615d10db8ca9c6c162d7bdbc3a9ee834ded1dc1...4ce6a4708d2847374e2ec110511638f4dc51753c)

---
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-kw41z,openthread/ot-kw41z