Specify the length of VARCHAR columns

Platforms in the MySQL/MariaDB family require that.

tests/Doctrine/Tests/ORM/Functional/Ticket/GH12063Test.php

@@ -67,7 +67,7 @@ enum GH12063Code: string
 class GH12063Association
 {
     #[Id]
-    #[Column]
+    #[Column(length: 3)]
     public GH12063Code $code;
 }
 
@@ -80,6 +80,6 @@ class GH12063Entity
     public int|null $id = null;
 
     #[ORM\ManyToOne]
-    #[ORM\JoinColumn(referencedColumnName: 'code')]
+    #[ORM\JoinColumn(referencedColumnName: 'code', options: ['length' => 3])]
     public GH12063Association $association;
 }