minor #6577 Fix AdminDashboard attribute routes type (JorickPepin)

This PR was merged into the 4.x branch.

Discussion
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Fix `AdminDashboard` attribute routes type

The following configuration, which seems valid according to [the doc](https://symfony.com/bundles/EasyAdminBundle/4.x/crud.html#crud-routes), does not pass type validation (`Array does not have offset 'routeName'`):

```PHP
#[AdminDashboard([
    'new' => ['routePath' => 'creer'],
    'edit' => ['routePath' => '{entityId}/modifier'],
    'delete' => ['routePath' => '{entityId}/supprimer'],
])]
class DashboardController extends AbstractDashboardController
```

Commits
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cd18514 Fix `AdminDashboard` attribute routes type

Author: javiereguiluz

src/Attribute/AdminDashboard.php

@@ -9,7 +9,7 @@
 class AdminDashboard
 {
     public function __construct(
-        /** @var array<string, array{routeName: string, routePath: string}>|null */
+        /** @var array<string, array{routeName?: string, routePath?: string}>|null */
         public ?array $routes = null,
         /** @var class-string[]|null $allowedControllers If defined, only these CRUD controllers will have a route defined for them */
         public ?array $allowedControllers = null,