Update upload action

Author: chris

.github/workflows/build_xplat.yml

@@ -35,7 +35,7 @@ jobs:
               run: ./make-ci.sh
 
             - name: upload result
-              uses: actions/upload-artifact@v2
+              uses: actions/upload-artifact@v4
               with:
                 name: build-${{ matrix.os }}
                 path: dist/*.tar.bz2