[BUG][python-flask] file as primitive

Hi everyone,
I'm using openapi generator to generate python-flask server for a few weeks, and I have had some concerns since I start using multipart/form-data with a blob. It seems to generate this kind of things :
@property def profile_image(self) -> file:
'file' is not defined, but yeah I never seen this kind of type in Python? Is that normal that 'file' is considered as a primitive type even in documentation?
I will update the issue if it's a real concern, I'm not sure about it.
Thanks a lot

test.yaml:

openapi: 3.1.0
info:
  title: Webhook Example
  version: 1.0.0
servers:
- url: /
paths:
  /somes:
    post:
      operationId: somes_post
      requestBody:
        content:
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/Something'
        description: Somes something
      responses:
        "200":
          description: Return a 200 status to indicate that the data was received
            successfully
      x-openapi-router-controller: openapi_server.controllers.default_controller
components:
  schemas:
    Something:
      properties:
        id:
          format: uuid
          type: string
        address:
          $ref: '#/components/schemas/Something_address'
        profileImage:
          format: binary
          type: string
    Something_address:
      properties:
        street:
          title: street
          type: string
        city:
          title: city
          type: string
      title: Something_address

Generation command:
openapi-generator_7.2.0.sh generate -i ./api/v1/test.yaml -g python-flask -o src/test --global-property skipFormModel=false

Run command:
python3 -m openapi_server

Start with the supplied test.yaml and the python-flask generator invoked by the generation command, then inspect the generated model containing profile_image. Run the generated server with python3 -m openapi_server and determine whether the file annotation is invalid or only a documentation issue. Done means the generated Python output handles the multipart binary field correctly and the behavior is covered by a regression test.