submodule: bump openthread from `0402bc8` to `eca7675` (#237)
submodule: bump openthread from `0402bc8` to `eca7675` (#237)

Bumps [openthread](https://github.com/openthread/openthread) from `0402bc8` to `eca7675`.
- [Commits](https://github.com/openthread/openthread/compare/0402bc8183294c8c400e178edcf3e9ff09df5acc...eca7675acbc0cf9c62a7c8ad96eb555ac9edb622)

---
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-cc13x2-cc26x2,openthread/ot-cc13x2-cc26x2