maintainers: add email of katexochen (#354433)

Author: sikmir

maintainers/maintainer-list.nix

@@ -11250,6 +11250,7 @@
     name = "katanallama";
   };
   katexochen = {
+    email = "[email protected]";
     github = "katexochen";
     githubId = 49727155;
     matrix = "@katexochen:matrix.org";