Updated style [skip ci]

Author: ankane

test/pqxx_test.cpp

@@ -110,7 +110,8 @@ void test_stream(pqxx::connection& conn) {
     pgvector::Vector embedding({1, 2, 3});
     tx.exec("INSERT INTO items (embedding) VALUES ($1)", {embedding});
     int count = 0;
-    for (const auto& [id, embedding2] : tx.stream<int, pgvector::Vector>("SELECT id, embedding FROM items WHERE embedding IS NOT NULL")) {
+    auto stream = tx.stream<int, pgvector::Vector>("SELECT id, embedding FROM items WHERE embedding IS NOT NULL");
+    for (const auto& [id, embedding2] : stream) {
         assert_equal(embedding2, embedding);
         count++;
     }