halo2_gadgets: depend on rand with default-features = false
#4092
| Job | Run time |
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| 1m 35s | |
| 1m 13s | |
| 1m 27s | |
| 3m 32s | |
| 1m 15s | |
| 14s | |
| 3m 14s | |
| 3m 29s | |
| 5m 7s | |
| 3m 25s | |
| 2m 58s | |
| 3m 33s | |
| 3m 12s | |
| 7m 13s | |
| 2m 56s | |
| 3m 12s | |
| 6m 49s | |
| 2m 33s | |
| 58m 4s |