upgrade igraph to 0.10.15 and python_igraph to 0.11.8
#5029
| Job | Run time |
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| 1m 38s | |
| 1h 23m 47s | |
| 6h 0m 14s | |
| 14m 55s | |
| 8m 9s | |
| 1h 22m 24s | |
| 14m 46s | |
| 1h 9m 31s | |
| 1h 18m 30s | |
| 12m 19s | |
| 1h 15m 25s | |
| 13m 9s | |
| 1h 9m 3s | |
| 18m 0s | |
| 1h 16m 4s | |
| 1h 6m 40s | |
| 1h 18m 20s | |
| 1h 30m 52s | |
| 1h 21m 6s | |
| 1h 17m 15s | |
| 1h 14m 40s | |
| 2h 31m 11s | |
| 2h 33m 46s | |
| 3h 23m 46s | |
| 1h 31m 17s | |
| 1d 10h 6m 47s |