submodule: bump third_party/openthread/repo from f75e2bb to `a0b9ac…
#5063
| Job | Run time |
|---|---|
| 27m 19s | |
| 27m 19s | |
| 20m 6s | |
| 19m 8s | |
| 4m 0s | |
| 4m 0s | |
| 17m 41s | |
| 17m 41s | |
| 24m 4s | |
| 24m 4s | |
| 29m 3s | |
| 29m 3s | |
| 4h 3m 28s |