Fix OpenAPI create response status

Author: tobyzerner

src/Endpoint/Create.php

@@ -128,7 +128,7 @@ public function getOpenApiPaths(Collection $collection, JsonApi $api): array
                         ),
                     ],
                     'responses' => [
-                        '200' => [
+                        '201' => [
                             'content' => $this->buildOpenApiContent(
                                 array_map(
                                     fn($resource) => ['$ref' => "#/components/schemas/$resource"],