submodule: bump third_party/openthread/repo from 75694d2 to a8afffb
#4394
| Job | Run time |
|---|---|
| 3m 20s | |
| 3m 20s |
75694d2 to a8afffb
#4394
| Job | Run time |
|---|---|
| 3m 20s | |
| 3m 20s |