submodule: bump openthread from `814a6c1` to `9272666` (#126)
submodule: bump openthread from `814a6c1` to `9272666` (#126)

Bumps [openthread](https://github.com/openthread/openthread) from `814a6c1` to `9272666`.
- [Commits](https://github.com/openthread/openthread/compare/814a6c17effac4e3f5bb7c3ed57166ea748f1cc6...9272666541c463a1e04e4ab51b0a813e590af1d0)

---
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-efr32,openthread/ot-efr32,openthread/ot-efr32