gh-144914: use mimalloc for raw allocations on free-threading
#238270
| Job | Run time |
|---|---|
| 3s | |
| 3s | |
| 6s |
mimalloc for raw allocations on free-threading
#238270
| Job | Run time |
|---|---|
| 3s | |
| 3s | |
| 6s |