`injector.Injector.create_object` on pydantic-settings `BaseSettings` does not without factory function in Injector

As stated in this closed bug at pydantic-settings, i cannot achieve an initialization through injector on python 3.8 and 3.9 (works ok on 3.10+) without a factory method.

The issue was turned down by the pydantic-settings team.

The error message

TypeError: unsupported operand type(s) for |: 'type' and 'NoneType'

Why ?

Pydantic BaseSettings base class uses PEP-604 (str | None) annotation instead of PEP-484 (Union, Optional).
It seems that Pydantic BaseSettings class don’t like to be initialized through cls.__new__(cls).

This works

class Configuration(Module):
    def configure(self, binder: Binder):
        binder.bind(BaseSettings, scope=SingletonScope, to=lambda: BaseSettings())

This does not

class Configuration(Module):
    def configure(self, binder: Binder):
        binder.bind(BaseSettings, scope=SingletonScope)

Reproduced issue

https://github.com/Guibod/pydantic-settings-bug-298

Start at injector.Injector.create_object and reproduce the reported binding behavior with pydantic-settings BaseSettings on Python 3.8 and 3.9, using the linked pydantic-settings-bug-298 reproduction. Done means a direct BaseSettings binding works without requiring a factory function, while preserving the behavior that works on Python 3.10+.