Confirm this plugin works with wildcard spec parameter

```yml
- name: Run bonus tests 🧪
# https://github.com/cypress-io/github-action
uses: cypress-io/github-action@v4
with:
spec: 'cypress/integration/bonus*.js'
env:
SPLIT: ${{ strategy.job-total }}
SPLIT_INDEX: ${{ strategy.job-index }}
```

Start with the YAML workflow shown in the issue and reproduce it using cypress-io/github-action@v4, the wildcard spec, and the split variables. Confirm whether matching specs are discovered and distributed correctly; done means documenting the result or identifying the needed change.

Written by the indexing model from the issue text.