ci: update build.yml

Author: OptiJava

.github/workflows/build.yml

@@ -26,6 +26,6 @@ jobs:
       run: |
         python -m mcdreforged pack -o ./build
 
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         path: build/