[BUG] [Kotlin] Enums generated for kotlinx serialization fails deserialization

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• 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)

Description

Enums generated for kotlinx serialization are marked as @Contextual, causing failures in json deserialization

openapi-generator version

7.16.0

OpenAPI declaration file content or url

openapi: 3.0.4
info:
  title: test
  version: 1.0.0
tags:
  - name: test
paths: {}
components:
    schemas:
     XYZType:
         type: string
         enum:
              - "ONE"

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

Start with the minimal OpenAPI YAML in the report and the Kotlin kotlinx serialization generation configuration, then inspect the generated enum annotations. Reproduce the JSON deserialization failure and compare it with the expected behavior; done means generated enums deserialize without the reported @Contextual failure.