ci: bump linux to latest & drop py3.8
#247
| Job | Run time |
|---|---|
| 19m 18s | |
| 56m 35s | |
| 19m 22s | |
| 19m 10s | |
| 20m 48s | |
| 56m 19s | |
| 18m 58s | |
| 57m 33s | |
| 59m 40s | |
| 56m 42s | |
| 57m 29s | |
| 19m 13s | |
| 20m 58s | |
| 21m 6s | |
| 58m 54s | |
| 1h 0m 29s | |
| 2s | |
| 10h 22m 36s |