fix the parse_merge test not to rely on all dialects supporting boolean litterals

Author: lovasoa

tests/sqlparser_common.rs

@@ -8346,7 +8346,7 @@ fn parse_merge() {
         _ => unreachable!(),
     };
 
-    let sql = "MERGE INTO s.bar AS dest USING newArrivals AS S ON false WHEN NOT MATCHED THEN INSERT VALUES (stg.A, stg.B, stg.C)";
+    let sql = "MERGE INTO s.bar AS dest USING newArrivals AS S ON (1 > 1) WHEN NOT MATCHED THEN INSERT VALUES (stg.A, stg.B, stg.C)";
     verified_stmt(sql);
 }