muffon: 2.1.0 -> 2.2.0 (#398513)

pkgs/by-name/mu/muffon/package.nix

···
 
 let
   pname = "muffon";
-  version = "2.1.0";
+  version = "2.2.0";
   src = fetchurl {
     url = "https://github.com/staniel359/muffon/releases/download/v${version}/muffon-${version}-linux-x86_64.AppImage";
-    hash = "sha256-GT91MLjBWsbk9P5fsIxlYUNziAPsdvMSPq9bLL3rKDw=";
+    hash = "sha256-VzT/jlNmUYFmUUqi8EzE4ilawezqhSgXHz32+S3FMTo=";
   };
   appimageContents = appimageTools.extractType2 { inherit pname src version; };
 in