submodule: bump openthread from `cbd8512` to `a793c94` (#189)
submodule: bump openthread from `cbd8512` to `a793c94` (#189)

Bumps [openthread](https://github.com/openthread/openthread) from `cbd8512` to `a793c94`.
- [Commits](https://github.com/openthread/openthread/compare/cbd8512f47043466d0d71f5246f33058bcc1e500...a793c94d617084f45ff14af5c0b86148ae37a6ad)

---
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