v4 for upload-artifact

Author: brokkoli71

.github/workflows/ci.yml

@@ -56,7 +56,7 @@ jobs:
       - name: Assemble JAR
         run: mvn package -DskipTests
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: jar
           path: target/*.jar