Fix unrelated phpstan error

Author: uuf6429

tests/Js/EventsTest.php

@@ -2,6 +2,7 @@
 
 namespace Behat\Mink\Tests\Driver\Js;
 
+use Behat\Mink\KeyModifier;
 use Behat\Mink\Tests\Driver\TestCase;
 
 final class EventsTest extends TestCase
@@ -87,6 +88,8 @@ public function testMouseOver(): void
     }
 
     /**
+     * @param KeyModifier::*|null $modifier
+     *
      * @dataProvider provideKeyboardEventsModifiers
      */
     public function testKeyboardEvents(?string $modifier, string $eventProperties): void