fix: move stray import to top of file (E402)

tests/test_custom_route_class.py

@@ -5,6 +5,7 @@ from fastapi.testclient import TestClient
 from inline_snapshot import snapshot
 from starlette.routing import Route
 
+from typing import Any, Callable, Sequence
 app = FastAPI()
 
 
@@ -121,10 +122,6 @@ def test_openapi_schema():
     )
 
 
-from collections.abc import Callable, Sequence
-from typing import Any
-
-
 class LegacyAPIRoute(APIRoute):
     """Route subclass with explicit __init__ matching the pre-strict_content_type signature."""