text: Title: OpenAPI v3 Handling Issue
  Body: Hello,
  
  We have had a BlackSheep app running for over a year. When we attempted to upgrade to 2.0.7, we ran into this error. It seems to be an error in the fundamental OpenAPI class. Since this was working fine until today, I think that it must be a bug in 1.0.9. 
  
  Here is the error message:
  
  ```Traceback (most recent call last):
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 307, in _get_array_outer_type
      return field_info.outer_type_
  AttributeError: 'FieldInfo' object has no attribute 'outer_type_'
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/application.py", line 726, in _handle_lifespan
      await self.start()
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/application.py", line 715, in start
      await self.after_start.fire()
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/application.py", line 126, in fire
      await handler(self.context, *args, **kwargs)
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/common.py", line 404, in build_docs
      docs = self.generate_documentation(app)
    File "/home/mistral/llm_server_env/datascience-llm-server/app/docs/handler.py", line 34, in generate_documentation
      paths=self.get_paths(app),
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 449, in get_paths
      own_paths = self.get_routes_docs(app.router, path_prefix)
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 1146, in get_routes_docs
      request_body=self.get_request_body(handler),
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 847, in get_request_body
      content=self._get_body_binder_content_type(body_binder, body_examples),
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 821, in _get_body_binder_content_type
      return {
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 823, in <dictcomp>
      schema=self.get_schema_by_type(body_binder.expected_type),
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 642, in get_schema_by_type
      schema = self._get_schema_by_type(child_type, type_args)
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 663, in _get_schema_by_type
      return self._get_schema_for_class(object_type)
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 567, in _get_schema_for_class
      for field in self.get_fields(object_type):
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 739, in get_fields
      return handler.get_type_fields(
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 342, in get_type_fields
      return [
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 345, in <listcomp>
      self._open_api_v2_field_schema_to_type(
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 297, in _open_api_v2_field_schema_to_type
      return self._get_array_outer_type(field_info)
    File "/home/mistral/llm_server_env/lib/python3.10/site-packages/blacksheep/server/openapi/v3.py", line 311, in _get_array_outer_type
      return List[field_info.annotation.__args__[0]]
  AttributeError: type object 'list' has no attribute '__args__'. Did you mean: '__add__'?```