Describe the bug
When using a URLField in a Django model and then using a ModelSchema for serialization/validation on a POST request, the url is just validated as a str. Most other fields are covered in Ninja, but this one seems to be missing.

Versions (please complete the following information):

• Python version: [e.g. 3.6] 3.11.9
• Django version: [e.g. 4.0] 5.0
• Django-Ninja version: [e.g. 0.16.2] 1.1.0
• Pydantic version: [e.g. 1.9.0] 2.7.1