text: Title: [BUG] Adding Field examples breaks generated swagger docs
  Body: **Describe the bug**
  Using the approach described in #1115 to add a description of a parameter, the generated swagger docs break when the `example=` property is added. The generated API docs show `Could not render Parameters, see the console.`
  
  **Versions (please complete the following information):**
   - Python version: 3.11.6
   - Django version: 5.1
   - Django-Ninja version: 1.3.0
   - Pydantic version: 2.9.2
  
  Example:
  ```
  from datetime import datetime, timezone
  from typing import Annotated
  from typing import List
  
  from ninja import Router, Query, Schema, Field
  
  router = Router()
  
  class FilterParams(Schema):
      end: Annotated[
          datetime,
          Field(
              examples=[datetime.now(timezone.utc)],       # fails when this line is uncommented
              description="ISO-formatted timestamp of the latest item to return",
          ),
      ]
  
  @router.get(
      "",
      url_name="list",
      response=List[MySchemaOut],
  )
  def my_list(request, filters: Query[FilterParams]):
      pass
  ```