Use update-artifacts v4

Author: stanleymw

.github/workflows/folia.yml

@@ -36,7 +36,7 @@ jobs:
         run: |
           sh build.sh
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: FoliaToGo
           path: Folia/build/libs/*.jar