[Bug, python-legacy] Generate list of reference is generated as an object instead of list[Pet] with OpenAPI 3.1.0

Created by: GuillaumeSmaha

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

The response for findByStatus is generated as a object instead of a list.

openapi-generator version

6.2.1 or master branch

OpenAPI declaration file content or url

Based on https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/test/resources/3_0/petstore_oas3_test.yaml and updating the OpenAPI version to 3.1.0 (removing license to be compatible)

openapi: 3.1.0
servers:
  - url: 'http://petstore.swagger.io/v2'
info:
  description: >-
    A test spec based on the Petstore spec with OAS3 related test cases such as nullable
  version: 1.0.0
  title: OpenAPI Petstore
tags:
  - name: pet
    description: Everything about your Pets
  - name: store
    description: Access to Petstore orders
  - name: user
    description: Operations about user
paths:
  /pet/findByStatus:
    get:
      tags:
        - pet
      summary: Finds Pets by status
      description: Multiple status values can be provided with comma separated strings
      operationId: findPetsByStatus
      parameters:
        - name: status
          in: query
          description: Status values that need to be considered for filter
          required: true
          style: form
          explode: false
          schema:
            type: array
            items:
              type: string
              enum:
                - available
                - pending
                - sold
              default: available
      responses:
        '200':
          description: successful operation
          content:
            application/xml:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Pet'
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Pet'
        '400':
          description: Invalid status value
      security:
        - petstore_auth:
            - 'write:pets'
            - 'read:pets'
components:
  schemas:
    Category:
      title: Pet category
      description: A category for a pet
      type: object
      properties:
        id:
          type: integer
          format: int64
        name:
          type: string
      xml:
        name: Category
    User:
      title: a User
      description: A User who is purchasing from the pet store
      type: object
      properties:
        id:
          type: integer
          format: int64
        username:
          type: string
        firstName:
          type: string
        lastName:
          type: string
        email:
          type: string
        password:
          type: string
        phone:
          type: string
        userStatus:
          type: integer
          format: int32
          description: User Status
      xml:
        name: User
    Tag:
      title: Pet Tag
      description: A tag for a pet
      type: object
      properties:
        id:
          type: integer
          format: int64
        name:
          type: string
      xml:
        name: Tag
    Pet:
      title: a Pet
      description: A pet for sale in the pet store
      type: object
      required:
        - name
        - photoUrls
      properties:
        id:
          type: integer
          format: int64
        category:
          $ref: '#/components/schemas/Category'
        name:
          type: string
          example: doggie
        photoUrls:
          type: array
          xml:
            name: photoUrl
            wrapped: true
          items:
            type: string
        tags:
          type: array
          xml:
            name: tag
            wrapped: true
          items:
            $ref: '#/components/schemas/Tag'
        status:
          type: string
          description: pet status in the store
          enum:
            - available
            - pending
            - sold
      xml:
        name: Pet

Steps to reproduce

docker run --rm -u $(id -u):$(id -g) -v $(pwd):/local -w /local \
                         openapitools/openapi-generator-cli:latest generate \
                  -i petstore_oas3.1_test.yaml \
                  -o python-client \
                  -g python-legacy

Result expected

For example, using python-legacy generator, I get:

        response_types_map = {
            200: "object",
            400: None,
        }

instead of a list of Pet with OpenAPI: 3.0.x:

        response_types_map = {
            200: "list[Pet]",
            400: None,
        }