Change download-artifact github action version to v4 (#652)

Author: darrylong

.github/workflows/python-publish.yml

@@ -87,10 +87,11 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: actions/download-artifact@v2
+    - uses: actions/download-artifact@v4
       with:
-        name: wheels
-        path: dist/
+        path: dist
+        pattern: wheels-*
+        merge-multiple: true
 
     - name: Set up Python
       uses: actions/setup-python@v5