chore(ci): pin greenlet version to 3.1.0 for 3.8 [backport 2.19]
#2619
| Job | Run time |
|---|---|
| 1m 23s | |
| 1m 25s | |
| 1m 39s | |
| 1m 53s | |
| 1m 36s | |
| 1m 37s | |
| 1m 37s | |
| 1m 47s | |
| 1m 54s | |
| 2m 2s | |
| 16m 53s |