Disable update plugins mu-plugin

disable-update-plugins.php

<?php
/**
 * Plugin Name: Disable updates plugins
 * Plugin URI: https://kagg.eu/en/
 * Description: Disable update of certain plugins.
 * Version: 1.2
 * Author: KAGG Design
 * Author URI: https://kagg.eu/en/
 * License: GPL2
 *
 * @package disable-update-plugins
 */

/**
 * Filter update_plugins transient.
 *
 * @param mixed $value Transient value.
 *
 * @return mixed
 */
function filter_update_plugins( $value ) {
	if ( ! isset( $value->response ) ) {
		return $value;
	}

	// Array of plugin slugs.
	$disable_update_plugins = [
		'some-plugin-slug',
	];

	foreach ( $value->response as $name => $plugin ) {
		foreach ( $disable_update_plugins as $disable_update_plugin ) {
			if ( stripos( $name . '/', $disable_update_plugin ) === 0 ) {
				unset( $value->response[ $name ] );
			}
		}
	}

	return $value;
}

add_filter( 'site_transient_update_plugins', 'filter_update_plugins', PHP_INT_MAX, 2 );