Add unknown scc code

Author: mantas-done

src/Code/Converters/SccConverter.php

@@ -1396,6 +1396,7 @@ private static function codesToBytes(string $codes): int // AD00 FFAA
         '8380' => '',
         '0137' => '',
         '1fad' => '',
+        '167c' => '',
     ];
 
     private static $characters = [