Bump actions/upload-artifact to v4

v2 was deprecated [1]

[1] https://github.blog/changelog/2024-02-13-deprecation-notice-v1-and-v2-of-the-artifact-actions/

Author: luhenry

.github/workflows/ci.yaml

@@ -59,7 +59,7 @@ jobs:
               run: sudo make python-dists-${{ matrix.manylinux_arch }}
 
             - name: Upload build artifacts
-              uses: actions/upload-artifact@v2
+              uses: actions/upload-artifact@v4
               with:
                   name: ${{ matrix.arch }}
                   path: dist