Ran rector and made tests final

tests/EnvVarProcessors/AddSlashEnvVarProcessorTest.php

@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /*
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -17,13 +20,12 @@
  *  You should have received a copy of the GNU Affero General Public License
  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
-
 namespace App\Tests\EnvVarProcessors;
 
 use App\EnvVarProcessors\AddSlashEnvVarProcessor;
 use PHPUnit\Framework\TestCase;
 
-class AddSlashEnvVarProcessorTest extends TestCase
+final class AddSlashEnvVarProcessorTest extends TestCase
 {
     protected AddSlashEnvVarProcessor $processor;