Fix java version

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/bungeecore/Node.java

@@ -98,7 +98,7 @@ public abstract class Node {
         if (JAVA_8.contains(serverJar))
             cmd.add("/usr/lib/jvm/java-8-openj9-amd64/bin/java");
         else
-            cmd.add("java");
+            cmd.add("/usr/lib/jvm/java-21-openj9-amd64/bin/java");
 
         for(String param : dParams){
             cmd.add("-D" + param);