fix: use die instead of give_die

to prevent expected result output from wp_die

ref #4071

includes/api/class-give-api.php

@@ -1782,7 +1782,7 @@ public function output( $status_code = 200 ) {
 		 */
 		do_action( 'give_api_output_after', $this->data, $this, $format );
 
-		give_die();
+		die();
 	}
 
 	/**