Fix compatibility issue with pydantic 2.5.0

Import FieldInfo from its original package

news/18.bugfix

@@ -0,0 +1,4 @@
+From Pydantic 2.5.0 the FieldInfo class is no more available in the pydantic.main
+module. Its only available in the pydantic.fields module. The import from the
+pydantic.main module was a mistake since it relied on an transitive import from
+pydantic.fields to pydantic.main. This is no more the case in Pydantic 2.5.0.

src/extendable_pydantic/main.py

@@ -15,7 +15,8 @@
     from typing import _Final as _TypingBase  # type: ignore[attr-defined,unused-ignore]
 
 from pydantic._internal._model_construction import ModelMetaclass
-from pydantic.main import BaseModel, FieldInfo
+from pydantic.fields import FieldInfo
+from pydantic.main import BaseModel
 
 from .utils import all_identical, resolve_annotation