1) Added a descriptor for AI 7041 - UN/CEFACT freight unit type

  2) Pinned Fluent Assertions to 7.1.0 in test project.
  3) Updated test project from SpecFlow to Reqnroll.

Author: cnayoung

LICENSE.txt

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2018-2024 Solidsoft Reply Ltd.
+   Copyright 2018-2025 Solidsoft Reply Ltd.
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.