[BUG] Input parameter of type array can not have default array

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

a input parameter of type array cannot take an array as default Parameter in Generator Version 3.3.4, when generating it it says:

-attribute paths.'/'(get).parameters.[orderSpecifier].schemas.default is not of type string``

openapi-generator version

3.3.4

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: Customer API
  version: v1.0
tags:
- name: customers
  description: API to obtain customer information
servers:
- url: /admin/api/customers/v1
paths:
  /:
    get:
      summary: Get customers
      operationId: customers
      tags:
      - customers
      parameters:
      - in: query
        name: orderSpecifier
        description: takes an array of columns the results can be ordered by
        schema:
          type: array
          items:
            $ref: '#/components/schemas/CustomerOrderSpecifier'
          default: [CODE, NAME]
      responses:
        '200':
          description: A collection of customers
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CustomerCollection'
        '401':
          description: Forbidden. Login is required

components:
  schemas:
    CustomerCollection:
      description: A collection of Customers with response meta data
      properties:
        total:
          type: integer
          format: int64
        startAt:
          type: integer
          format: int64
        maxResults:
          type: integer
          format: int64
        customers:
          type: array
          items:
            $ref: '#/components/schemas/Customer'
      required:
      - total
      - startAt
      - maxResults
      - customers
    Customer:
      type: object
      description: Customer
      properties:
        code:
          type: string
          description: The customer code
        name:
          type: string
          description: The customer name
        logo:
          type: string
          description: URL of the customer image
      required:
      - code
      - name
    CustomerOrderSpecifier:
      type: string
      enum:
        - CODE
        - NAME

Command line used for generation

openapi-generator-maven-plugin

Steps to reproduce

add provided yml to the maven project. Add a for the yml file and let the plugin generate the sources

Related issues/PRs

couldn't find anything.

Suggest a fix

will look for it later

Start with the supplied OpenAPI YAML and reproduce the failure through the openapi-generator-maven-plugin using version 3.3.4. Trace the generator's handling of the array parameter default; done means generation accepts the array default without reporting that it must be a string.