fix: remove unused ref parameter from GitHub Actions workflow (#4)

This pull request makes a minor update to the GitHub Actions workflow
configuration. The change removes the explicit checkout of a specific
commit SHA for workflow runs, likely simplifying the workflow and
relying on the default behavior.

- Removed the `ref: ${{ github.event.workflow_run.head_sha }}` line from
the `actions/checkout` step in `.github/workflows/main.yml` to simplify
the workflow configuration.

Author: matiaslopezd

.github/workflows/main.yml

@@ -17,7 +17,6 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          ref: ${{ github.event.workflow_run.head_sha }}
 
       - name: Setup Node.js
         uses: actions/setup-node@v4