fields.TimeDeltaField in pydantic_model_creator raise Input should be None [type=none_required, input_value=datetime.timedelta(second...104, microseconds=48382), input_type=timedelta]

Describe the bug
with
tortoise-orm==0.20.0
pydantic==2.2.1

code like:

class Task(Model):
        usage_time = fields.TimeDeltaField(null=True, blank=True, description='usgae')

class TaskListSchema(pydantic_model_creator(Task, name='TaskListSchema', exclude=('usage_time',))):
    pass

TaskListSchema.from_orm(task).dict()

will get error:

Traceback (most recent call last):
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 404, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 78, in __call__
    return await self.app(scope, receive, send)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\fastapi\applications.py", line 289, in __call__
    await super().__call__(scope, receive, send)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\applications.py", line 122, in __call__
    await self.middleware_stack(scope, receive, send)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\middleware\errors.py", line 184, in __call__
    raise exc
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\middleware\errors.py", line 162, in __call__
    await self.app(scope, receive, _send)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\middleware\base.py", line 108, in __call__
    response = await self.dispatch_func(request, call_next)
  File "D:\python_workspace\AutoTestServer\common\middlewares.py", line 18, in dispatch
    response = await call_next(request)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\middleware\base.py", line 84, in call_next
    raise app_exc
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\middleware\base.py", line 70, in coro
    await self.app(scope, receive_or_disconnect, send_no_error)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\middleware\cors.py", line 83, in __call__
    await self.app(scope, receive, send)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\middleware\exceptions.py", line 79, in __call__
    raise exc
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\middleware\exceptions.py", line 68, in __call__
    await self.app(scope, receive, sender)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\fastapi\middleware\asyncexitstack.py", line 20, in __call__
    raise e
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\fastapi\middleware\asyncexitstack.py", line 17, in __call__
    await self.app(scope, receive, send)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\routing.py", line 718, in __call__
    await route.handle(scope, receive, send)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\routing.py", line 276, in handle
    await self.app(scope, receive, send)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\starlette\routing.py", line 66, in app
    response = await func(request)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\fastapi\routing.py", line 273, in app
    raw_response = await run_endpoint_function(
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\fastapi\routing.py", line 190, in run_endpoint_function
    return await dependant.call(**values)
  File "D:\python_workspace\AutoTestServer\task\views.py", line 232, in task_list
    data = [TaskListSchema.from_orm(task).model_dump() for task in queryset]
  File "D:\python_workspace\AutoTestServer\task\views.py", line 232, in <listcomp>
    data = [TaskListSchema.from_orm(task).model_dump() for task in queryset]
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\typing_extensions.py", line 2562, in wrapper
    return __arg(*args, **kwargs)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\pydantic\main.py", line 1066, in from_orm
    return cls.model_validate(obj)
  File "D:\python_workspace\AutoTestServer\venv\lib\site-packages\pydantic\main.py", line 496, in model_validate
    return cls.__pydantic_validator__.validate_python(
pydantic_core._pydantic_core.ValidationError: 1 validation error for TaskListSchema
usage_time
  Input should be None [type=none_required, input_value=datetime.timedelta(second...104, microseconds=48382), input_type=timedelta]
    For further information visit https://errors.pydantic.dev/2.2/v/none_required

To Reproduce
print TaskListSchema will get

{
    "additionalProperties": false,
    "properties": {
        "usage_time": {
            "description": "\u4efb\u52a1\u8017\u65f6",
            "nullable": true,
            "title": "Usage Time",
            "type": "null"
        }
    },
    "required": [
        "usage_time"
    ],
    "title": "TaskListSchema",
    "type": "object"
}

when i use
tortoise-orm==0.19.2
pydantic==1.10.2

print TaskListSchema will get

{
    "title": "TaskListSchema",
    "description": "\u81ea\u52a8\u5316\u4efb\u52a1",
    "type": "object",
    "properties": {
        "usage_time": {
            "title": "Usage Time",
            "description": "\u4efb\u52a1\u8017\u65f6",
            "nullable": true,
            "type": "number",
            "format": "time-delta"
        }
    },
    "additionalProperties": false
}

this schema will work! Is there something change in pydantic_model_creator when handle fields.TimeDeltaField ?
Expected behavior
fields.TimeDeltaField in pydantic_model_creator works good

Additional context
Add any other context about the problem here.

Reproduce the issue with tortoise-orm 0.20.0 and pydantic 2.2.1 using the provided TimeDeltaField and pydantic_model_creator example. Inspect how pydantic_model_creator handles fields.TimeDeltaField, comparing the generated schema with the working older versions. Done means the generated field accepts a datetime.timedelta value and produces the expected non-null time-delta schema.