ci: upgrade upload-artifact to v4

Author: percevalw

.github/workflows/release.yml

@@ -35,7 +35,7 @@ jobs:
           CIBW_ARCHS_MACOS: "x86_64 arm64"
           PIP_EXTRA_INDEX_URL: "https://download.pytorch.org/whl/cpu"
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           path: ./wheelhouse/*.whl
 
@@ -48,7 +48,7 @@ jobs:
       - name: Build sdist
         run: pipx run build --sdist
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           path: dist/*.tar.gz