submodule: bump openthread from `9a2d84a` to `2d977b0` (#270)
submodule: bump openthread from `9a2d84a` to `2d977b0` (#270)

Bumps [openthread](https://github.com/openthread/openthread) from `9a2d84a` to `2d977b0`.
- [Commits](https://github.com/openthread/openthread/compare/9a2d84a4b78413e20f269df96a855e573e04a616...2d977b0edd66d25e5f748e67540f44f2480092f1)

---
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