chore(tests): cleanup bootstrap.php to be forward-compatible

Signed-off-by: Daniel Kesselberg <mail@danielkesselberg.de>

Author: kesselb

tests/bootstrap.php

@@ -1,18 +1,20 @@
 <?php
 
 declare(strict_types=1);
+
 /**
  * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 
 use OCP\App\IAppManager;
+use OCP\Server;
 
 if (!defined('PHPUNIT_RUN')) {
 	define('PHPUNIT_RUN', 1);
 }
 
 require_once __DIR__ . '/../../../lib/base.php';
+require_once __DIR__ . '/../../../tests/autoload.php';
 
-\OC::$server->get(IAppManager::class)->loadApp('serverinfo');
-OC_Hook::clear();
+Server::get(IAppManager::class)->loadApp('serverinfo');