chore(dart_frog_cli): remove package:universal_io

Author: felangel

packages/dart_frog_cli/bin/dart_frog.dart

@@ -1,5 +1,6 @@
+import 'dart:io';
+
 import 'package:dart_frog_cli/src/command_runner.dart';
-import 'package:universal_io/io.dart';
 
 Future<void> main(List<String> args) async {
   final exitCode = await DartFrogCommandRunner().run(args);