maintainers: add undefined-landmark

maintainers/maintainer-list.nix

···
     githubId = 799353;
     keys = [ { fingerprint = "EE59 5E29 BB5B F2B3 5ED2  3F1C D276 FF74 6700 7335"; } ];
   };
+  undefined-landmark = {
+    name = "bas";
+    email = "[e-mail]";
+    github = "undefined-landmark";
+    githubId = 74454337;
+  };
   undefined-moe = {
     name = "undefined";
     email = "[e-mail]";