bumped symfony to 5.3

src/Controller/Admin/BlogCrudController.php

@@ -22,6 +22,7 @@ class BlogCrudController extends AbstractCrudController
 	        AssociationField::new('author')
 		        ->autocomplete(),
 	        TextField::new('title'),
+	        TextField::new('slug'),
 	        TextEditorField::new('teaser'),
 	        TextEditorField::new('content'),
 	        DateTimeField::new('createdAt'),