MERGEBACK: fix wheel upload

Author: jgriffiths

.github/workflows/wheels.yml

@@ -50,4 +50,15 @@ jobs:
 
       - uses: actions/upload-artifact@v4
         with:
+          name: wheels-${{ matrix.os }}-${{ strategy.job-index }}
           path: ./wheelhouse/*.whl
+
+  merge:
+    runs-on: ubuntu-latest
+    needs: build_wheels
+    steps:
+      - name: Merge Artifacts
+        uses: actions/upload-artifact/merge@v4
+        with:
+          name: all-wheels
+          pattern: wheels-*