Update upload-artifact version to v4

Author: mworchel

.github/workflows/wheels.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           output-dir: wheelhouse
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           path: ./wheelhouse/*.whl
 
@@ -48,7 +48,7 @@ jobs:
     - name: Check metadata
       run: twine check dist/*
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         path: dist/*.tar.gz