[BUG][JAVA][SPRING] Openapi generator does not work properly with array example when use 3.1.1 specification format

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

I use openapi generator with spring boot. I have specification of api and i want use 3.1.1 Openapi version. I have a model with arrays and want to provide example.

when I set into spec 3.1.1 version i have a such code in generated files (incorrect):

  @Schema(name = "nodes", example = "[{name=Node1}, {name=Node2}, {name=Node3}]", description = "List of nodes in the EventGraph.", requiredMode = Schema.RequiredMode.NOT_REQUIRED)

when i set 3.0.1 version in spec file i have this (correct):

@Schema(name = "nodes", example = "[{\"name\":\"Node1\"},{\"name\":\"Node2\"},{\"name\":\"Node3\"}]", description = "List of nodes in the EventGraph.", requiredMode = Schema.RequiredMode.NOT_REQUIRED)

openapi-generator version

gradle plugin id "org.openapi.generator" version "7.12.0"
generator: spring

OpenAPI declaration file content or url

openapi: 3.1.1
info:
  title: EventGraph API
  version: 1.0.0
paths:
  /simplePost:
    post:
      summary: Simple post request
      description: description
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SomeDTO'
      responses:
        '200':
          description: Expected response to a valid request
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/SomeDTO"
components:
  schemas:
    SomeDTO:
      type: object
      properties:
        name:
          type: string
        nodes:
          description: List of nodes in the EventGraph.
          type: array
          items:
            $ref: '#/components/schemas/NodeDTO'
          example:
            - name: Node1
            - name: Node2
            - name: Node3
    NodeDTO:
      type: object
      properties:
        name:
          type: string
      required:
        - name

Generation Details

generator - spring

openApiGenerate {
    generatorName = "spring"
    inputSpec = "${project.projectDir}/src/main/resources/error-test.yml".replace("\\","/")
    outputDir = "${buildDir}/generated"
    apiPackage = "pro.axenix_innovation.axenapi.web.api"
    modelPackage = "pro.axenix_innovation.axenapi.web.model"
    configOptions = [
            useSpringBoot3: "true",
            interfaceOnly: "true",
            useTags: "true",
            generateBuilders: "true",
            generatedConstructorWithRequiredArgs: "true",
            generateConstructorWithAllArgs: "true"
    ]
}

Steps to reproduce

Use my specification(i thing any spec with array example). Use gradle plugin with specification in the issue

Related issues/PRs

Suggest a fix

Reproduce the issue with the supplied 3.1.1 specification and the Spring generator configuration, then compare it with the 3.0.1 output. Trace how the array example is converted into the generated Java @Schema annotation. Done means the 3.1.1 output preserves the JSON object syntax shown by the 3.0.1 output and the relevant generator tests pass.