style: fix formatting in test_security_middleware.py

- Applied `ruff format` to `tests/controller/test_security_middleware.py` to fix CI failure.
- Verified linting passes with `poetry run ruff format --check`.

Co-authored-by: lgcorzo <46710567+lgcorzo@users.noreply.github.com>

Author: google-labs-jules[bot]

tests/controller/test_security_middleware.py

@@ -2,13 +2,15 @@
 from fastapi.middleware.trustedhost import TrustedHostMiddleware
 from regression_model_template.controller.kafka_app import app
 
+
 def test_middleware_presence():
     """Test that security middlewares are present in the FastAPI app."""
     middleware_types = [m.cls for m in app.user_middleware]
 
     assert CORSMiddleware in middleware_types, "CORSMiddleware should be present"
     assert TrustedHostMiddleware in middleware_types, "TrustedHostMiddleware should be present"
 
+
 def test_cors_configuration():
     """Test CORS configuration defaults."""
     cors_middleware = next((m for m in app.user_middleware if m.cls == CORSMiddleware), None)
@@ -24,6 +26,7 @@ def test_cors_configuration():
     assert options["allow_methods"] == ["*"]
     assert options["allow_headers"] == ["*"]
 
+
 def test_trusted_host_configuration():
     """Test TrustedHost configuration defaults."""
     trusted_host_middleware = next((m for m in app.user_middleware if m.cls == TrustedHostMiddleware), None)