submodule: bump third_party/openthread/repo from dc6bf36 to `75694d…
#4301
| Job | Run time |
|---|---|
| 7m 8s | |
| 7m 8s |
dc6bf36 to `75694d…
#4301
| Job | Run time |
|---|---|
| 7m 8s | |
| 7m 8s |