lib.maintainers.nicoo: update GH account name (#411470)

maintainers/maintainer-list.nix

···
   };
   nicoo = {
     email = "[e-mail]";
-    github = "nbraud";
+    github = "nicoonoclaste";
     githubId = 1155801;
     name = "nicoo";
     keys = [ { fingerprint = "E44E 9EA5 4B8E 256A FB73 49D3 EC9D 3708 72BC 7A8C"; } ];