style: ruff format conformance (CAR-1335)

- tests/test_openapi.py: collapse 2 blank lines to 1 (ruff format)
- tests/conftest.py: collapse 2 blank lines to 1 (ruff format)

These format nits block lint (a hard gate). The conftest.py one was
introduced in CAR-1132 (#42) and would have blocked every subsequent PR
on dev until fixed.

Refs CAR-1335, CAR-1135.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

tests/test_openapi.py

@@ -18,6 +18,7 @@ def test_dispose_engine_importable_from_database():
     assert callable(dispose_engine)
     assert dispose_engine.__name__ == "dispose_engine"
 
+
 EXPECTED_ROUTES = [
     # Auth (3 — register/login/refresh are handled by Better-Auth service)
     ("get", "/auth/me"),