Fixed cast for json to dart Map<String, dynamic> instead of Map<String, String> in too/secrets.dart

tool/secrets.dart

@@ -12,7 +12,7 @@ Future<void> main() async {
       : secretsTestPath;
 
   final inoutContent = File(inputPath).readAsStringSync();
-  final config = json.decode(inoutContent) as Map<String, String>;
+  final config = json.decode(inoutContent) as Map<String, dynamic>;
   final output =
       'const salt = \'${config["salt"]}\';\nconst key = \'${config["key"]}\';\nconst walletSalt = \'${config["walletSalt"]}\';\nconst shortKey = \'${config["shortKey"]}\';\nconst change_now_api_key = \'${config["change_now_api_key"]}\';';