upgrades example to 2.5.0

Author: Dopeamin

packages/passkeys/passkeys/example/lib/auth_service.dart

@@ -1,5 +1,5 @@
 import 'package:passkeys/authenticator.dart';
-import 'package:passkeys/types.dart';
+import 'package:passkeys/availability.dart';
 import 'package:passkeys_example/local_relying_party_server.dart';
 
 class AuthService {

packages/passkeys/passkeys/example/pubspec.yaml

@@ -9,7 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  passkeys: ^2.4.0
+  passkeys: ^2.5.0
   go_router: ^10.1.2
   flutter_hooks: ^0.20.3
   riverpod: ^2.3.10