How to remove invulnerability after taking damage on the Minecraft Spigot 1.15.2 server

Here is something yes it turned out but the server issues Plugin noHitCooldown v1. 0 does not specify an api-version and does not work (the cooldown is still there)

Main:

package my.noHitCD.pulgin.noentityinvulnerabityplugin;

import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin {
    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(new EventsListener(), this);
    }
    
}

EventListener:

package my.noHitCD.pulgin.noentityinvulnerabityplugin;

import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.EntityDamageEvent;

public class EventsListener implements Listener {
    @EventHandler
    public void entityDamaged(EntityDamageEvent e) {
        e.setCancelled(true);
    }
}

Plugin.yml

name: noHitCooldown
main: my.noHitCD.pulgin.noentityinvulnerabityplugin
api-version: 1.13
version: 1.0
author: [V0W4N]

What method can be used to neutralize the CD for damage?