fix dead slime setSize invincibility

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftSlime.java

@@ -16,7 +16,7 @@ public class CraftSlime extends CraftMob implements Slime, CraftEnemy {
 
     @Override
     public void setSize(int size) {
-        this.getHandle().setSize(size, true);
+        this.getHandle().setSize(size, /* true */ getHandle().isAlive()); // Paper - fix dead slime setSize invincibility
     }
 
     @Override