use sets for ' in { ... }' checks

gallery_dl/extractor/aryion.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2020-2025 Mike Fährmann
+# Copyright 2020-2026 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -156,11 +156,11 @@ class AryionExtractor(Extractor):
             headers = response.headers
 
             # folder
-            if headers["content-type"] in (
+            if headers["content-type"] in {
                 "application/x-folder",
                 "application/x-comic-folder",
                 "application/x-comic-folder-nomerge",
-            ):
+            }:
                 return False
 
             # get filename from 'Content-Disposition' header