Fix variant of unloadChunkRequest that was incorrectly never deprecated

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/World.java

@@ -257,7 +257,9 @@ public interface World extends PluginMessageRecipient, Metadatable {
      * @param z Z-coordinate of the chunk
      * @param safe Controls whether to queue the chunk when players are nearby
      * @return Whether the chunk was actually queued
+     * @deprecated it is never safe to remove a chunk in use
      */
+    @Deprecated
     public boolean unloadChunkRequest(int x, int z, boolean safe);
 
     /**