Replace patch('litellm._redis._get_redis_client_logic') with monkeypatch.setenv
in test_max_connections_url_config and test_max_connections_url_config_string_value.
The mock was unreliable in CI (REDIS_URL is set to the real Redis Cloud server),
causing the pool to silently use the real config instead of the test config.
Using monkeypatch.setenv tests the full env-var→pool chain more robustly and
matches the actual production code path.
