MILAN — After Gucci showed its cruise collection in London last May, I described Sabato De Sarno as stubborn. After Gucci showed its Spring 2025 collection in Milan on Friday, I’m revising that impression. De Sarno is true to himself, obsessively, almost painfully, so. “My taste is the same as it was at the start,” he insisted at a preview on Thursday. “It’s exactly what I want for Gucci, what Gucci means today.” And he is…