submodule: bump openthread from `5bc71b2` to `a282aa9` (#259)
submodule: bump openthread from `5bc71b2` to `a282aa9` (#259)

Bumps [openthread](https://github.com/openthread/openthread) from `5bc71b2` to `a282aa9`.
- [Commits](https://github.com/openthread/openthread/compare/5bc71b2a4fe72a911f7c8088f94e54b2104a2c72...a282aa9f9bb297950007442927a89fd1cd9b7f39)

---
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-b91,openthread/ot-b91