ci: Use actions/checkout@v4, not v1 or v2.
#68
| Job | Run time |
|---|---|
| 2m 2s | |
| 2m 2s |
actions/checkout@v4, not v1 or v2.
#68
| Job | Run time |
|---|---|
| 2m 2s | |
| 2m 2s |