submodule: bump openthread from `7af484f` to `9a104a8` (#376)
submodule: bump openthread from `7af484f` to `9a104a8` (#376)

Bumps [openthread](https://github.com/openthread/openthread) from `7af484f` to `9a104a8`.
- [Commits](https://github.com/openthread/openthread/compare/7af484f49f83f579445d827f1b540a97d7462059...9a104a814c67eb15b95c22db95330b8b823e127c)

---
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-nrf528xx,openthread/ot-nrf528xx