Run tests against the latest prerelease version of Swashbuckle

[bkoelman]

Run tests against the latest prerelease version of Swashbuckle, which supports new .NET 8 ModelState attributes

QUALITY CHECKLIST

• [x] Changes implemented in code
• [x] Complies with our contributing guidelines
• [x] Adapted tests
• [ ] N/A: Documentation updated

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.30%. Comparing base (e35da84) to head (3c48e2c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## openapi #1568 +/- ## ======================================== Coverage 91.30% 91.30% ======================================== Files 396 396 Lines 12834 12834 Branches 2028 2028 ======================================== Hits 11718 11718 Misses 725 725 Partials 391 391 ```

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