Add missing CakePHP schema classes to unserialize allowlist

TableSchema contains nested Column, Index, Constraint and other
schema objects that also need to be allowed for deserialization.

Author: dereuromark

src/Command/BakeMigrationDiffCommand.php

@@ -20,8 +20,14 @@
 use Cake\Console\ConsoleOptionParser;
 use Cake\Database\Connection;
 use Cake\Database\Schema\CachedCollection;
+use Cake\Database\Schema\CheckConstraint;
 use Cake\Database\Schema\CollectionInterface;
+use Cake\Database\Schema\Column;
+use Cake\Database\Schema\Constraint;
+use Cake\Database\Schema\ForeignKey;
+use Cake\Database\Schema\Index;
 use Cake\Database\Schema\TableSchema;
+use Cake\Database\Schema\UniqueKey;
 use Cake\Datasource\ConnectionManager;
 use Cake\Event\Event;
 use Cake\Event\EventManager;
@@ -554,6 +560,12 @@ protected function getDumpSchema(Arguments $args): array
             'allowed_classes' => [
                 TableSchema::class,
                 CachedCollection::class,
+                Column::class,
+                Index::class,
+                Constraint::class,
+                UniqueKey::class,
+                ForeignKey::class,
+                CheckConstraint::class,
             ],
         ]);
     }