Use LinkedHashMap in ChannelInitializeListenerHolder (#13000)

Author: Moulberry

paper-server/src/main/java/io/papermc/paper/network/ChannelInitializeListenerHolder.java

@@ -6,7 +6,7 @@
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 import java.util.Collections;
-import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.Map;
 
 /**
@@ -16,7 +16,7 @@
  */
 public final class ChannelInitializeListenerHolder {
 
-    private static final Map<Key, ChannelInitializeListener> LISTENERS = new HashMap<>();
+    private static final Map<Key, ChannelInitializeListener> LISTENERS = new LinkedHashMap<>();
     private static final Map<Key, ChannelInitializeListener> IMMUTABLE_VIEW = Collections.unmodifiableMap(LISTENERS);
 
     private ChannelInitializeListenerHolder() {