Rename 'emery' maintainer handle to 'ehmry', fixes #11493

Communication happens on Github so names should be consistent.

nixos/tests/cjdns.nix

@@ -25,7 +25,7 @@ in
 import ./make-test.nix ({ pkgs, ...} : {
   name = "cjdns";
   meta = with pkgs.stdenv.lib.maintainers; {
-    maintainers = [ emery ];
+    maintainers = [ ehmry ];
   };
 
   nodes = rec
@@ -122,4 +122,4 @@ import ./make-test.nix ({ pkgs, ...} : {
 
       $bob->succeed("curl --fail -g http://[$aliceIp6]");
     '';
-})
+})