♻️ Import Pydantic v2 specifics only in Pydantic v2 tests

tests/test_union_body_discriminator.py

@@ -3,7 +3,7 @@ from typing import Any, Dict, Union
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from inline_snapshot import snapshot
-from pydantic import BaseModel, Field, Tag
+from pydantic import BaseModel, Field
 from typing_extensions import Annotated, Literal
 
 from .utils import needs_pydanticv2
@@ -11,6 +11,8 @@ from .utils import needs_pydanticv2
 
 @needs_pydanticv2
 def test_discriminator_pydantic_v2() -> None:
+    from pydantic import Tag
+
     app = FastAPI()
 
     class FirstItem(BaseModel):