[DoctrineBridge] Fix deprecation with doctrine/dbal ^4.3

Author: alexandre-daubois

src/Symfony/Bridge/Doctrine/Tests/Fixtures/SingleAssociationToIntIdEntity.php

@@ -14,13 +14,15 @@
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
 use Doctrine\ORM\Mapping\Id;
+use Doctrine\ORM\Mapping\JoinColumn;
 use Doctrine\ORM\Mapping\OneToOne;
 
 #[Entity]
 class SingleAssociationToIntIdEntity
 {
     public function __construct(
         #[Id, OneToOne(cascade: ['ALL'])]
+        #[JoinColumn(nullable: false)]
         protected SingleIntIdNoToStringEntity $entity,
 
         #[Column(nullable: true)]