Migrate actions/upload-artifact@v4

ref https://github.com/actions/download-artifact/blob/v4.1.1/docs/MIGRATION.md#multiple-uploads-to-the-same-named-artifact

Author: ddelange

.github/workflows/main.yml

@@ -93,7 +93,7 @@ jobs:
 
     - uses: actions/upload-artifact@v4
       with:
-        name: dist
+        name: dist-${{ matrix.only }}
         path: wheelhouse/*.whl
 
 
@@ -113,8 +113,9 @@ jobs:
 
     - uses: actions/download-artifact@v4
       with:
-        name: dist
         path: dist/
+        pattern: dist-*
+        merge-multiple: true
 
     - run: ls -ltra dist/