submodule: bump openthread from `15d25ee` to `0a74d66` (#236)
submodule: bump openthread from `15d25ee` to `0a74d66` (#236)

Bumps [openthread](https://github.com/openthread/openthread) from `15d25ee` to `0a74d66`.
- [Commits](https://github.com/openthread/openthread/compare/15d25eed7f12bfe3620597af54435933cf0d9a47...0a74d66fedd3c9558ccf298055305a0eef5a6896)

---
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