fix(anvil): use header.number not best_number
#16207
| Job | Run time |
|---|---|
| 1m 12s | |
| 10s | |
| 1m 26s | |
| 2m 50s | |
| 2m 54s | |
| 1m 19s | |
| 14s | |
| 4s | |
| 3m 43s | |
| 6m 23s | |
| 7m 25s | |
| 7m 3s | |
| 5m 59s | |
| 9m 41s | |
| 6m 6s | |
| 6m 23s | |
| 8m 3s | |
| 12m 34s | |
| 13m 39s | |
| 11m 49s | |
| 2s | |
| 1h 48m 59s |