gh-115999: Add free-threaded specialization for SEND.
#2290
| Job | Run time |
|---|---|
| 6m 38s | |
| 18m 7s | |
| 10m 13s | |
| 10m 54s | |
| 18m 17s | |
| 9m 55s | |
| 4m 47s | |
| 6m 20s | |
| 19m 51s | |
| 9m 55s | |
| 9m 27s | |
| 8m 42s | |
| 8m 3s | |
| 5m 34s | |
| 1h 11m 11s | |
| 33m 41s | |
| 4h 11m 35s |