[BUG][Go] Wrong code generation for "Any Type"

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?
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Description

I have an Any Type declaration in my openapi file and the code generator produces an unexpected output as it generates code for an object type.

To represent an Any Type in Go, one would use interface{}, instead of map[string]interface{} which is used to represent an Object Type.

However, the currently generated code is map[string]interface{}.

openapi-generator version

latest and v6.5.0

OpenAPI declaration file content

swagger: "2.0"
info: 
  title: "Example with a list of any type"
  version: 0.0.1

paths: 
  /example: 
    get: 
      responses: 
        "200":
          description: "Returns a list of any type"
          schema: 
            $ref: '#/definitions/ContainsListOfAnyType'

definitions:
  ContainsListOfAnyType:
    type: object
    properties:
      values:
        type: array
        items:
          {}

Steps to reproduce

• Store the given yml file as as example.yml
• Run docker run --rm -v "${PWD}:/local" openapitools/openapi-generator-cli generate -i /local/example.yml -g go -o /local/out/go

using grep -A 2 'type ContainsListOfAnyType struct {' out/go/model_contains_list_of_any_type.go, one can see that the generated code for ContainsListOfAnyType is

type ContainsListOfAnyType struct {
	Values []map[string]interface{} `json:"values,omitempty"`
}

whereas the expected output would be

type ContainsListOfAnyType struct {
	Values []interface{} `json:"values,omitempty"`
}

Reproduce the issue with example.yml using the Docker generate command, then inspect out/go/model_contains_list_of_any_type.go and trace how the Go generator maps the empty array-item schema. Done means the generated Values field uses []interface{} for Any Type while object schemas continue to use map[string]interface{}.