disable pyo3's gil-refs migration feature
#847
| Job | Run time |
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| 44s | |
| 1m 17s | |
| 1m 28s | |
| 1m 32s | |
| 1m 20s | |
| 46s | |
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| 2m 9s | |
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| 3m 32s | |
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| 1m 44s | |
| 2m 53s | |
| 4m 25s | |
| 1m 16s | |
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| 2m 55s | |
| 4m 21s | |
| 1m 28s | |
| 1m 37s | |
| 2m 46s | |
| 4m 38s | |
| 1m 29s | |
| 3m 34s | |
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| 3m 45s | |
| 1m 20s | |
| 1m 41s | |
| 2m 36s | |
| 3m 10s | |
| 54s | |
| 54s | |
| 1h 12m 45s |