Fix compatibility with Python 3.14 when using the Pydantic integration with Pydantic V2.
Previously, importing strawberry.experimental.pydantic on Python 3.14 would trigger:
UserWarning: Core Pydantic V1 functionality isn't compatible with Python 3.14 or greater.
This is now fixed by avoiding pydantic.v1 imports on Python 3.14+.
Releases contributed by @patrick91 via #4072