submodule: bump openthread from `7e4d4d5` to `5cfbcfc` (#337)
submodule: bump openthread from `7e4d4d5` to `5cfbcfc` (#337)

Bumps [openthread](https://github.com/openthread/openthread) from `7e4d4d5` to `5cfbcfc`.
- [Commits](https://github.com/openthread/openthread/compare/7e4d4d5cc19d91ce83a593eca7ea563f6d3fe3e6...5cfbcfcbf4cbf1e33cdeb00db9b7f8903374c4e2)

---
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