Bump actions/upload-artifact from 3 to 4

.github/workflows/build_wheels.yml

@@ -20,9 +20,10 @@ jobs:
         uses: pypa/[email protected]
         env:
           CIBW_ARCHS_MACOS: x86_64 arm64
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: ./wheelhouse/*.whl
+          name: wheels-${{ matrix.os }}
 
   build_sdist:
     name: Build source distribution
@@ -37,9 +38,10 @@ jobs:
         run: python -m pip install setuptools setuptools-scm wheel Cython numpy scikit-learn
       - name: Build sdist
         run: python setup.py sdist
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: dist/*.tar.gz
+          name: sdist
 
   upload_testpypi:
     if: github.event_name == 'release' && github.event.action == 'published'
@@ -51,9 +53,9 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: artifact
+          merge-multiple: true
           path: dist
       - uses: pypa/[email protected]
         with:
@@ -69,8 +71,8 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
-          name: artifact
           path: dist
+          merge-multiple: true
       - uses: pypa/[email protected]