Setup composer-unused fails

```
Setup PHP
...
==> Setup Tools
✓ composer Added composer 2.5.1
✗ composer-unused Could not setup composer-unused
```
https://github.com/codeigniter4/shield/actions/runs/4089160981/jobs/7051577041

Ref https://github.com/composer-unused/composer-unused/issues/444