[BUG] [Python] Arbitrary typed arrays are not handled property in OpenAPI version 2.0

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 am trying to generate a Python client from a Swagger 2.0 schema but the generated types are not what I expect them to be.

openapi-generator version

I am using version 7.8.0-SNAPSHOT but have also downloaded and tried the 8.0.0-SNAPSHOT.

OpenAPI declaration file content or url

swagger: '2.0'
paths:
  /workflows/start:
    post:
      parameters:
        - in: body
          name: body
          required: true
          schema:
            $ref: '#/definitions/PayloadDefinition'
      responses:
        '200':
          description: Request succeeded
definitions:
  PayloadDefinition:
    properties:
      ArrayArgs:
        type: array
        items: {}

If I convert this to what I think is an equivalent OpenAPI 3.0.3 schema like:

openapi: '3.0.3'
info:
  title: Example API
  version: 1.0.0
paths:
  /workflows/start:
    post:
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PayloadDefinition'
      responses:
        '200':
          description: Request succeeded
components:
  schemas:
    PayloadDefinition:
      properties:
        ArrayArgs:
          type: array
          items: {}

the generated type is correct, i.e. array_args: Optional[List[Any]] = Field(default=None, alias="ArrayArgs").

Generation Details

openapi-generator generate -i ./schema.yaml -g python -o ./client

Steps to reproduce

1. Run the generate command above
2. Check client/openapi_client/models/payload_definition.py
3. Line 29 is incorrect:

   array_args: Optional[List[Dict[str, Any]]] = Field(default=None, alias="ArrayArgs")
   

   The type annotation should be Optional[List[Any]]

Related issues/PRs

N/A

Suggest a fix

The generated type should be a list of Any.

Run the supplied openapi-generator command with the Swagger 2.0 schema, then inspect client/openapi_client/models/payload_definition.py and compare it with the OpenAPI 3.0.3 result. The work is done when the Swagger 2.0 generated annotation for ArrayArgs is Optional[List[Any]] rather than Optional[List[Dict[str, Any]]].