Fix support for FastAPI>=0.123.9 in tests

Author: zmievsa

tests/test_router_generation.py

@@ -1222,7 +1222,7 @@ async def test():
     client_2000, *_ = create_versioned_clients().values()
 
     dependant = cast("APIRoute", client_2000.app.router.versioned_routers["2000-01-01"].routes[-1]).dependant
-    assert dependant.dependencies[1].dependencies[0].security_requirements[0].security_scheme is auth_header_scheme
+    assert dependant.dependencies[1].dependencies[0]._security_scheme is auth_header_scheme
     response = client_2000.get("/test")
     assert response.status_code == expected_status_code
     assert response.json() == {"detail": "Not authenticated"}