DX: apply rector rules for phpunit up to 90

src/Bundle/ChillActivityBundle/Tests/Timeline/TimelineProviderTest.php

@@ -19,6 +19,9 @@ use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
  */
 final class TimelineProviderTest extends WebTestCase
 {
+    /**
+     * @doesNotPerformAssertions
+     */
     public function testAnActivityIsShownOnTimeline(): never
     {
         $this->markTestSkipped('we have to write fixtures before writing this tests');