feat: use download-artifact instead of manually downloading it

This should hopefully work on private repos too!

.forgejo/workflows/check.yml

@@ -35,7 +35,6 @@ jobs:
           comment-on-pr: ${{ github.ref_name != 'main' }}
           # Generate artifacts on main (to speed up comparisons)
           generate-artifact: ${{ github.ref_name == 'main' }}
-          github-token: ${{ secrets.ARTIFACT_TOKEN }}
           # Generate comparisons to main
           do-comparison: 'true'
           # This job's name (so we can find the artifacts)