fix workflow

Author: TimotheeMathieu

.github/workflows/build-wheels.yml

@@ -32,7 +32,7 @@ jobs:
           CIBW_TEST_COMMAND: "pytest --pyargs sklearn_extra"
         run: |
           python -m cibuildwheel --output-dir wheelhouse
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           path: ./wheelhouse/*.whl
 
@@ -53,7 +53,7 @@ jobs:
       - name: Build sdist
         run: python setup.py sdist
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           path: dist/*.tar.gz