[BUG][python-nextgen] Untyped object as request body uses StrictStr dict values

Created by: robertschweizer

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• 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?
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Description

Using a request body with

schema:
  type: object

The generated Python function accepts the parameter

body : Optional[Dict[str, StrictStr]] = None

Since I'm not restricting the value types of the object, I believe it should be

body : Optional[Dict[str, Any]] = None

Note: I get this warning during generation:

[main] WARN  o.o.c.l.PythonNextgenClientCodegen - Codegen property is null (e.g. map/dict of undefined type). Default to string (StrictStr in Pydantic)

openapi-generator version

6.4.0 + 6.5.0-20230309.033622-35

OpenAPI declaration file content or url

openapi: 3.0.1
info:
  title: ""
  version: ""
paths:
  /test/endpoint:
    post:
      requestBody:
        content:
          application/json:
            schema:
              type: object
      responses:
        200:
          description: OK

Generation Details

openapi-generator-cli generate -i swagger.yaml -g python-nextgen

Steps to reproduce

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