Create a failing test presenting open api 3.1 - enum property schema enumAsRef error

[damiankaplon]

The test from the PR fails.

However, after changing the model resolver to generate open api 3.0 with ⬇️ works as expected

final ModelResolver modelResolver = new ModelResolver(mapper()).openapi31(true);

[damiankaplon]

@frantuma Could you please have a look? Here is the issue. I created the test on my own but the fix was generated with agentic 🤖