python3Packages.pygments: add ryand56 as maintainer

pkgs/development/python-modules/pygments/default.nix

···
       description = "Generic syntax highlighter";
       mainProgram = "pygmentize";
       license = lib.licenses.bsd2;
-      maintainers = with lib.maintainers; [ sigmanificient ];
+      maintainers = with lib.maintainers; [
+        sigmanificient
+        ryand56
+      ];
     };
   };
 in