submodule: bump openthread from `545c089` to `3132099` (#139)
submodule: bump openthread from `545c089` to `3132099` (#139)

Bumps [openthread](https://github.com/openthread/openthread) from `545c089` to `3132099`.
- [Commits](https://github.com/openthread/openthread/compare/545c0894298b2cc504bd89e60695024d4c2e10b1...31320993fbf477a75c384b16529ea129a1f6d0e5)

---
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-cc2538,openthread/ot-cc2538