chore: add exclude

Author: kenjis

.github/workflows/test-phpcpd.yml

@@ -43,4 +43,4 @@ jobs:
           extensions: dom, mbstring
 
       - name: Detect code duplication
-        run: phpcpd --exclude system/Test --exclude system/ThirdParty --exclude system/Database/SQLSRV/Builder.php --exclude system/Database/SQLSRV/Forge.php --exclude system/Database/MySQLi/Builder.php --exclude system/Database/OCI8/Builder.php -- app/ public/ system/
+        run: phpcpd --exclude system/Test --exclude system/ThirdParty --exclude system/Database/SQLSRV/Builder.php --exclude system/Database/SQLSRV/Forge.php --exclude system/Database/MySQLi/Builder.php --exclude system/Database/OCI8/Builder.php --exclude system/I18n/TimeLegacy.php -- app/ public/ system/