test: fix pydantic@v2 deprecation warning in tests

[sobolevn]

It used to be:

tests/unit/test_openapi/test_schema.py::test_create_schema_for_pydantic_field
  /home/runner/work/litestar/litestar/.venv/lib/python3.11/site-packages/pydantic/fields.py:792: PydanticDeprecatedSince20: Using extra keyword arguments on `Field` is deprecated and will be removed. Use `json_schema_extra` instead. (Extra keys: 'example'). Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.3/migration/
    warn(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html

Now the warning is gone.
Docs: https://docs.pydantic.dev/2.3/migration/#changes-to-pydanticfield
Closes #2341

[sobolevn]

@provinzkraut looks like codeql is broken. It is only run on schedule event now, but the CI thinks that it is still required.

I think that it should be disabled as a required check in CI or updated to be run on pull_request and push

[provinzkraut]

@sobolevn It seems that the wrong CodeQL job was selected in the branch protection rules. I updated this. I think it should work now.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[sobolevn]

Thanks!

[github-actions]

Documentation preview will be available shortly at https://litestar-org.github.io/litestar-docs-preview/2340