No redirect after core upgrade

no-redirect-after-core-update.php

<?php # -*- coding: utf-8 -*-
/* Plugin Name: T5 No redirect after core upgrade */
add_action( '_core_updated_successfully', 't5_no_redirect_after_update', 0 );

function t5_no_redirect_after_update()
{
	show_message( __('WordPress updated successfully') );

	// Include admin-footer.php and exit
	include(ABSPATH . 'wp-admin/admin-footer.php');

	exit;
}