submodule: bump third_party/openthread/repo from `c9f23cc` to `3350f59` (#1316)
submodule: bump third_party/openthread/repo from `c9f23cc` to `3350f59` (#1316)

Bumps [third_party/openthread/repo](https://github.com/openthread/openthread) from `c9f23cc` to `3350f59`.
- [Commits](https://github.com/openthread/openthread/compare/c9f23ccddaaa08f4c5cc2b8a9160eac1e2b4a2e9...3350f598f6759fd7de0c80845a925197458d0420)

---
updated-dependencies:
- dependency-name: third_party/openthread/repo
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/borderrouter,openthread/ot-br-posix,openthread/ot-br-posix,openthread/ot-br-posix,openthread/borderrouter,openthread/borderrouter,openthread/borderrouter,openthread/borderrouter,openthread/ot-br-posix,openthread/ot-br-posix,openthread/borderrouter,openthread/ot-br-posix