ci: fix flaky test. (#18430)

Author: youngsofun

tests/sqllogictests/suites/query/functions/02_0000_function_aggregate_mix.test

@@ -579,7 +579,7 @@ INSERT INTO convert_string (c1, c2, c3) VALUES
 ('b', 1, 2);
 
 query IT
-select c1, string_agg(json_object('col', c2, 'no2', c3), ',') from convert_string group by c1;
+select c1, string_agg(json_object('col', c2, 'no2', c3), ',') from convert_string group by c1 order by c1;
 ----
 a {"col":1,"no2":1},{"col":2,"no2":1},{"col":1,"no2":1},{"col":1,"no2":2},{"col":2,"no2":2}
 b {"col":1,"no2":1},{"col":2,"no2":1},{"col":1,"no2":2}