minor #51624 [Messenger] Fix DoctrineIntegrationTest (derrabus)

This PR was merged into the 6.4 branch.

Discussion
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[Messenger] Fix DoctrineIntegrationTest

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Follows #51615
| License       | MIT
| Doc PR        | N/A

Fixes a DBAL 2 incompatibility introduced by #51615.

Commits
-------

c980956 [Messenger] Fix DoctrineIntegrationTest

src/Symfony/Component/Messenger/Bridge/Doctrine/Tests/Transport/DoctrineIntegrationTest.php

@@ -58,12 +58,14 @@ public function testSendWithDelay()
     {
         $this->connection->send('{"message": "Hi i am delayed"}', ['type' => DummyMessage::class], 600000);
 
-        $result = $this->driverConnection->createQueryBuilder()
+        $qb = $this->driverConnection->createQueryBuilder()
             ->select('m.available_at')
             ->from('messenger_messages', 'm')
             ->where('m.body = :body')
-            ->setParameter('body', '{"message": "Hi i am delayed"}')
-            ->executeQuery();
+            ->setParameter('body', '{"message": "Hi i am delayed"}');
+
+        // DBAL 2 compatibility
+        $result = method_exists($qb, 'executeQuery') ? $qb->executeQuery() : $qb->execute();
 
         $available_at = new \DateTimeImmutable($result->fetchOne());