Fix: Direct (unallowed) cast from Consumer<T> to Consumer<Object>

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/EventBus.java

@@ -13,7 +13,7 @@ public class EventBus {
     @SuppressWarnings("unchecked") // This cast is safe, because handlers only get passed the type they subscribed to
     public <T extends Event> void subscribe(Class<T> eventType, Consumer<T> handler) {
         handlers.computeIfAbsent(eventType, k -> new CopyOnWriteArrayList<>())
-                .add((Consumer<Object>) handler);
+                .add((Consumer<Object>) (Consumer<?>) handler);
     }
 
     public <T extends Event> void publish(T event) {