Applied rector suggestions

src/Validator/UniqueValidatableInterface.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).
  *
@@ -17,7 +20,6 @@
  *  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\Validator;
 
 interface UniqueValidatableInterface
@@ -29,4 +31,4 @@ interface UniqueValidatableInterface
      * @return array An array of the form ['field1' => 'value1', 'field2' => 'value2', ...]
      */
     public function getComparableFields(): array;
-}
+}