[BUG][Kotlin] Integer enums outputs as a string

[CHervaudBetclic]

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)

Description

When using the generator for kotlin with the kotlinx serialization method, integer enums will be correctly serialized from integer to kotlin integer, but will be incorrectly deserialized from kotlin integer to string
This:

@Serializable
enum class SomeCode(val value: kotlin.Int) {
    @SerialName(value = "0")
    _0(0)
}

Should be this:

@Serializable
enum class SomeCode(val value: kotlin.Int) {
    @SerialName(value = 0)
    _0(0),
}

openapi-generator version

Latest (7.12.0)

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: Demo
  version: v1

components:
  schemas:
    Code:
      type: integer
      enum:
        - 0

paths:
  /do:
    get:
      summary: Do something
      responses:
        200:
          description: Successful response
          content:
            application/json:
              schema:
                type: object
                required:
                  - code
                properties:
                  code:
                    $ref: '#/components/schemas/Code'

Generation Details

Generate with Docker command:

docker run --rm -v $(pwd):/local openapitools/openapi-generator-cli generate -i /local/Test.yml -g kotlin -o /local/out/kotlin

Steps to reproduce

Generate with Docker command:

docker run --rm -v $(pwd):/local openapitools/openapi-generator-cli generate -i /local/Test.yml -g kotlin -o /local/out/kotlin

Related issues/PRs

Suggest a fix

The bug seems to be caused by the following line:

    @SerialName(value = {{#lambda.doublequote}}{{{value}}}{{/lambda.doublequote}})

Where double quotes are hard-coded
They should be conditionally added, whether it's a dataType string or integer.
I'm not sure if we can do conditional checks like that is the mustaches syntax, let me know if we can, it would be a pleasure to create a PR