Increase Dependabot cooldown from the default of 3 days to 7, as [required by zizmor](https://docs.zizmor.sh/audits/#rulesdependabot-cooldownconfigdays).
#87
| Job | Run time |
|---|---|
| 7s | |
| 7s | |
| 8s | |
| 13s | |
| 6s | |
| 41s |