Update download artifact stage

Author: aarranz

.github/workflows/tests.yml

@@ -79,7 +79,7 @@ jobs:
         with:
           github-token: ${{ secrets.github_token }}
           parallel-finished: true
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4
         if: startsWith(github.ref, 'refs/tags')
         with:
           name: wheel