Resolve #3503377 "Ci openapi validation slow"

Closes #3503377

openapi.yml

@@ -798,7 +798,9 @@ components:
           items:
             type: string
         props:
-          $ref: 'https://json-schema.org/draft-04/schema'
+          type: object
+          # @todo Uncomment this in a follow-up MR in https://www.drupal.org/i/3503377
+          # $ref: 'https://json-schema.org/draft-04/schema'
         slots:
           type: array
           items: