Apply dart auto fixes

lib/main.dart

@@ -4,7 +4,6 @@ import 'dart:io';
 
 import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_messaging/firebase_messaging.dart';
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:jiffy/jiffy.dart';
@@ -69,7 +68,7 @@ Future<void> main() async {
 }
 
 class Main extends StatefulWidget {
-  const Main({Key? key}) : super(key: key);
+  const Main({super.key});
 
   @override
   State<Main> createState() => _MainState();