submodule: bump openthread from `b9b9c19` to `ca8799a` (#376)
submodule: bump openthread from `b9b9c19` to `ca8799a` (#376)

Bumps [openthread](https://github.com/openthread/openthread) from `b9b9c19` to `ca8799a`.
- [Commits](https://github.com/openthread/openthread/compare/b9b9c19640df2e60692a7e9536cf9111595cee26...ca8799a4b86a38a89ee339b399d24e0c095fd0d8)

---
updated-dependencies:
- dependency-name: openthread
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-nxp,openthread/ot-nxp,openthread/ot-nxp