submodule: bump openthread from 3400692 to 6751122 (#759)
#1593
| Job | Run time |
|---|---|
| 23m 7s | |
| 23m 56s | |
| 47m 3s |
3400692 to 6751122 (#759)
#1593
| Job | Run time |
|---|---|
| 23m 7s | |
| 23m 56s | |
| 47m 3s |