submodule: bump openthread from `5eb973c` to `7dfde1f` (#278)
submodule: bump openthread from `5eb973c` to `7dfde1f` (#278)

Bumps [openthread](https://github.com/openthread/openthread) from `5eb973c` to `7dfde1f`.
- [Commits](https://github.com/openthread/openthread/compare/5eb973ce00d3eec5898d6cc63fd4a20f9e914111...7dfde1f12923f03c9680be4d838b94b7a2320324)

---
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