Required Software/NixOS: Replace yubioath-desktop with yubioath-flutter

Trying to use yubioath-desktop results on this error:

    yubioath-desktop has been deprecated by upstream in favor of yubioath-flutter

On the current stable channel (23.05).

Signed-off-by: Federico Damián Schonborn <fdschonborn@gmail.com>

README.md

@@ -357,7 +357,7 @@ let
         yubikey-personalization
         yubikey-personalization-gui
         yubico-piv-tool
-        yubioath-desktop
+        yubioath-flutter
 
         # Testing
         ent