gh-152168: Don't skip test_bigmem if _testcapi is missing
#270546
| Job | Run time |
|---|---|
| 3s | |
| 3s | |
| 6s |
test_bigmem if _testcapi is missing
#270546
| Job | Run time |
|---|---|
| 3s | |
| 3s | |
| 6s |