Update to Minecraft 1.21.4

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

paper-api/src/main/java/org/bukkit/entity/minecart/ExplosiveMinecart.java

@@ -28,6 +28,22 @@ public interface ExplosiveMinecart extends Minecart, Explosive {
      */
     public int getFuseTicks();
 
+    /**
+     * Gets the factor by which explosion yield increases based on Minecart
+     * speed.
+     *
+     * @return increase factor
+     */
+    public float getExplosionSpeedFactor();
+
+    /**
+     * Sets the factor by which explosion yield increases based on Minecart
+     * speed.
+     *
+     * @param factor new factor
+     */
+    public void setExplosionSpeedFactor(float factor);
+
     /**
      * Ignite this minecart's fuse naturally.
      */