update actions/download-artifact to v4

Author: lukaskratzel

.github/workflows/python-package.yml

@@ -97,7 +97,7 @@ jobs:
 
     steps:
     - name: Download all the dists
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: python-package-distributions
         path: dist/