[BUG] [kotlin] [kotlin-spring] using uniqueItems when returning array in endpoint response generate wrong return type

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

openapi-generator version

7.8.0

OpenAPI declaration file content or url

paths:
  /test:
    get:
      operationId: getTest
      tags:
        - test
      responses:
        200:
          content:
            application/json:
              schema:
                type: array
                uniqueItems: true
                items:
                  type: string

Generated code

fun getTest(): ResponseEntity<set<kotlin.collections.Set<kotlin.String>>> {

expected code:

fun getTest(): ResponseEntity<kotlin.collections.Set<kotlin.String>> {

however, the type is well generated when uniqueItems is used on a property that is inside an object

Steps to reproduce

• Set up project
• mvn clean compile

Start with the Kotlin Spring generator and reproduce the issue using the OpenAPI declaration in the report. Compare the generated endpoint return type for a top-level array with uniqueItems to the expected ResponseEntity<Set> form, then verify that the existing object-property case remains correct.