Generates all required parameters

[gbloggs]

Describe the bug
When using 8.1 against openapi-generator-maven-plugin 7.8.0, all parameters of an object are generated as required.

Expected behavior
When an object has say one required parameter, all parameters are generated as required, not just the one defined in the swagger

To Reproduce

    Business:
      type: object
      additionalProperties: false
      properties:
        id:
          $ref: '#/components/schemas/uuid'
        businessName:
          type: string
          pattern: '^[\w\d\s]*$'
          maxLength: 128
          example: Ogurets
        vatNumber:
          type: string
          pattern: '^[\w\d\s]*$'
          maxLength: 20
          example: GB999 9999 73
        companyNumber:
          type: string
          pattern: '^[\w\d\s]*$'
          maxLength: 20
          example: '9012345678'
        headOfficeAddress:
          $ref: '#/components/schemas/Address'
        logoUrl:
          $ref: '#/components/schemas/urlString'
      required:
        - businessName

versioin 8.1 generates against openapi-generator-maven-plugin 7.8.0:

// This file is generated by https://github.com/dart-ogurets/dart-openapi-maven - you should not modify it
// log generation bugs on Github, as part of the license, you must not remove these headers from the Mustache templates.
// this project is maintained as part of FeatureHub - please consider sponsoring us at https://github.com/featurehub-io

// Business
class Business {
    
      String id;
    
      String businessName;
    
      String vatNumber;
    
      String companyNumber;
    
      Address headOfficeAddress;
    
      String logoUrl;
   

  // id required: true nullable: false default:  inherited: false container false
  // businessName required: true nullable: false default:  inherited: false container false
  // vatNumber required: true nullable: false default:  inherited: false container false
  // companyNumber required: true nullable: false default:  inherited: false container false
  // headOfficeAddress required: true nullable: false default:  inherited: false container false
  // logoUrl required: true nullable: false default:  inherited: false container false
Business(
{
    required 
      this.id
    , 
        required 
      this.businessName
    , 
        required 
      this.vatNumber
    , 
        required 
      this.companyNumber
    , 
        required 
      this.headOfficeAddress
    , 
        required 
      this.logoUrl
   
     }
)

Whereas version 7.2 against openapi-generator-maven-plugin 7.8.0:

// This file is generated by https://github.com/dart-ogurets/dart-openapi-maven - you should not modify it
// log generation bugs on Github, as part of the license, you must not remove these headers from the Mustache templates.
// this project is maintained as part of FeatureHub - please consider sponsoring us at https://github.com/featurehub-io

// Business
class Business {
    
      String? id;
    
      String businessName;
    
      String? vatNumber;
    
      String? companyNumber;
    
      Address? headOfficeAddress;
    
      String? logoUrl;

Business(
{
    
    
    
        this.id
    , 
        required 
      this.businessName
    , 
        
    
    
        this.vatNumber
    ,                    
    
        this.companyNumber
    , 
        
    
    
        this.headOfficeAddress
    , 
        
    
    
        this.logoUrl
     }
);

Versions
We only support bug fixes on the latest version of this plugin, please
confirm which version you are using?
openapi-dart-generator 8.1
openapi-generator-maven-plugin 7.8.0,

Additional context
Add any other context about the problem here.

[rvowles]

This is deliberate (and in the README). The default nullability for openApi fields is nullable: false - so the new version reflects the correct definition as specified in the API document. required reflects serialization not nullability. I would recommend you make the fields nullable or give them a default value.