style(tests): add type hint

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: S1M0N38

tests/lua/conftest.py

@@ -13,7 +13,7 @@
 
 
 @pytest.fixture
-def tcp_client(port) -> Generator[socket.socket, None, None]:
+def tcp_client(port: int) -> Generator[socket.socket, None, None]:
     """Create and clean up a TCP client socket.
 
     Yields: