fix: Update StubServer.java to the latest spigot changes (#1345)

worldedit-bukkit/src/test/java/com/fastasyncworldedit/util/StubServer.java

@@ -50,6 +50,7 @@ import org.bukkit.plugin.ServicesManager;
 import org.bukkit.plugin.messaging.Messenger;
 import org.bukkit.scheduler.BukkitScheduler;
 import org.bukkit.scoreboard.ScoreboardManager;
+import org.bukkit.structure.StructureManager;
 import org.bukkit.util.CachedServerIcon;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -226,6 +227,11 @@ public class StubServer implements Server {
         return 0;
     }
 
+    @Override
+    public int getTicksPerWaterUndergroundCreatureSpawns() {
+        return 0;
+    }
+
     @Override
     public int getTicksPerAmbientSpawns() {
         return 0;
@@ -693,6 +699,11 @@ public class StubServer implements Server {
         return 0;
     }
 
+    @Override
+    public int getWaterUndergroundCreatureSpawnLimit() {
+        return 0;
+    }
+
     @Override
     public int getAmbientSpawnLimit() {
         return 0;
@@ -918,6 +929,11 @@ public class StubServer implements Server {
         return null;
     }
 
+    @Override
+    public @NotNull StructureManager getStructureManager() {
+        return null;
+    }
+
     /**
      * @deprecated
      */