submodule: bump openthread from `0c48ade` to `b2132a9` (#289)
submodule: bump openthread from `0c48ade` to `b2132a9` (#289)

Bumps [openthread](https://github.com/openthread/openthread) from `0c48ade` to `b2132a9`.
- [Commits](https://github.com/openthread/openthread/compare/0c48ade2ffb6fafd17a9b1ff94e3da453e4c519d...b2132a903162be76eb4ea8a107e82c4e0737525f)

---
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-samr21,openthread/ot-samr21