chore(deps): bump actions/download-artifact from 4 to 8 (remix-run#15072)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/pr-actions.yml

@@ -40,7 +40,7 @@ jobs:
         run: pnpm install --frozen-lockfile
 
       - name: 📥 Download result from upstream workflow
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: pr-checks-result
           github-token: ${{ github.token }}