Update artifact actions

- upload-artifact now requires unique name for each upload
- use pattern and merge-multiple options with download-artifact@v4 action to reproduce previous behaviour

.github/workflows/wheels.yml

@@ -26,11 +26,10 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: "recursive"
-
       - uses: pypa/[email protected]
-
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
+          name: wheels-${{ matrix.os }}
           path: ./wheelhouse/*.whl
 
   upload_pypi:
@@ -43,7 +42,8 @@ jobs:
     steps:
       - uses: actions/download-artifact@v4
         with:
-          name: artifact
+          pattern: wheels-*
+          merge-multiple: true
           path: dist
 
       - uses: pypa/gh-action-pypi-publish@release/v1