[BUG] Go client generate Wrong object name when using free form object

Bug Report Checklist

Description

when using free form object, the go client generator generates the wrong object name with "{}"

when using - $ref: '#/components/schemas/EmptyObject', it will generate MapmapOfStringinterface{}

openapi-generator version

v7.3.0

OpenAPI declaration file content or url

    RiskPolicyAction:
      type: object
      description: The data for risk condition.
      properties:
        type:
          $ref: '#/components/schemas/RiskPolicyActionType'
        content:
          description: 'Structured action data, JSON encoded'
          oneOf:
            - $ref: '#/components/schemas/RiskQuorumActionContent'
            - $ref: '#/components/schemas/RiskWorkflowActionContent'
            - $ref: '#/components/schemas/EmptyObject'
            
    EmptyObject:
      type: object
      description: The data for empty object.

  -->

##### Generation Details

`// RiskPolicyActionContent - Structured action data, JSON encoded
type RiskPolicyActionContent struct {
	RiskQuorumActionContent *RiskQuorumActionContent
	RiskWorkflowActionContent *RiskWorkflowActionContent
	MapmapOfStringinterface{} *map[string]interface{}
}
`
##### Steps to reproduce


##### Related issues/PRs


##### Suggest a fix

Start with the Go client generator and the OpenAPI declaration in this issue, then reproduce the output using the v7.3.0 example with the EmptyObject free-form schema. Compare the generated RiskPolicyActionContent member name with the intended model naming, and verify that regeneration produces a valid, correctly named field.