bolt-launcher: fix notifications

pkgs/by-name/bo/bolt-launcher/package.nix

···
   pango,
   cairo,
   pkg-config,
+  libnotify,
   buildFHSEnv,
   makeDesktopItem,
   copyDesktopItems,
···
       SDL2
       sdl3
       libGL
+      libnotify
     ])
     ++ lib.optionals enableRS3 (
       with pkgs;