Enhancement: support 3.14

[adhtruong]

Summary

• Update CI to test against 3.14
• Resolve any bugs

Basic Example

No response

Drawbacks and Impact

No response

Unresolved questions

No response

[MRigal]

From my tests, it works well, but the biggest problem here is the lack of compatibility of Pydantic V1 with Python 3.14 and newer...
Thus running tests using polyfactory on Python 3.14 triggers this warning, see also #759 :

.venv/lib/python3.14/site-packages/polyfactory/factories/pydantic_factory.py:85
  /foobar/.venv/lib/python3.14/site-packages/polyfactory/factories/pydantic_factory.py:85: UserWarning: Core Pydantic V1 functionality isn't compatible with Python 3.14 or greater.
    import pydantic.v1 as pydantic_v1  # type: ignore[no-redef]