chore(deps): update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -56,7 +56,7 @@ jobs:
 
       # 9. 上传构建产物
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: canteen-management-system
           path: bin/