[BUG] Adding Field examples breaks generated swagger docs

[boosh]

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