blockbench-electron: update maintainers

pkgs/applications/graphics/blockbench-electron/default.nix

···
     description = "A boxy 3D model editor powered by Electron";
     homepage = "https://blockbench.net/";
     license = licenses.gpl3Only;
-    maintainers = [ maintainers.ronthecookie ];
+    maintainers = [ maintainers.ckie ];
     platforms = [ "x86_64-linux" ];
   };
 }