submodule: bump openthread from `54af1ee` to `dc7676a` (#137)
submodule: bump openthread from `54af1ee` to `dc7676a` (#137)

Bumps [openthread](https://github.com/openthread/openthread) from `54af1ee` to `dc7676a`.
- [Commits](https://github.com/openthread/openthread/compare/54af1ee416c7988ad9338ff932c997a3ab263cae...dc7676a032ccd5610fbb0141c0c41c49cbb76710)

---
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-qorvo,openthread/ot-qorvo,openthread/ot-qorvo