Update to upload artifact v4

Author: virustotalop

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Build with Gradle
       run: ./gradlew build
     - name: Upload artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: dynamicgui
         path: bukkit/build/libs/DynamicGui-Bukkit**