Remove deprecation linked to kernel shutdown

src/Bundle/ChillPersonBundle/Tests/Controller/AccompanyingCourseControllerTest.php

@@ -19,6 +19,7 @@ use Chill\PersonBundle\Entity\Person;
 use DateTime;
 use Doctrine\ORM\EntityManagerInterface;
 use Iterator;
+use Symfony\Bundle\FrameworkBundle\KernelBrowser;
 use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
 use function array_pop;
 use function count;
@@ -32,13 +33,18 @@ final class AccompanyingCourseControllerTest extends WebTestCase
 {
     use PrepareClientTrait;
 
+    private KernelBrowser $client;
+
     protected function setUp(): void
     {
-        parent::setUp();
-        self::bootKernel();
         $this->client = $this->getClientAuthenticated();
     }
 
+    protected function tearDown(): void
+    {
+        self::ensureKernelShutdown();
+    }
+
     public function dataGenerateRandomUsers(): Iterator
     {
         self::bootKernel();
@@ -61,6 +67,8 @@ final class AccompanyingCourseControllerTest extends WebTestCase
             ->getScalarResult();
 
         yield [array_pop($personIds), array_pop($personIds)];
+
+        self::ensureKernelShutdown();
     }
 
     public function testNewWithoutUsers()