fix(device_info_plus): fix the error in the e2e test. (#3382)

Author: StanleyCocos

packages/device_info_plus/device_info_plus/example/integration_test/device_info_plus_test.dart

@@ -67,7 +67,7 @@ void main() {
 
   testWidgets('Can get non-null iOS utsname fields',
       (WidgetTester tester) async {
-    expect(iosInfo.utsname.machine, 'iPhone15,4');
+    expect(iosInfo.utsname.machine, isNotNull);
     expect(iosInfo.utsname.nodename, isNotNull);
     expect(iosInfo.utsname.release, isNotNull);
     expect(iosInfo.utsname.sysname, isNotNull);