maintainers: remove atemu

pkgs/games/anki/bin.nix

···
   meta = with lib; {
     inherit (anki.meta) license homepage description longDescription;
     platforms = [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ];
-    maintainers = with maintainers; [ mahmoudk1000 atemu ];
+    maintainers = with maintainers; [ mahmoudk1000 ];
   };
 
   passthru = { inherit sources; };