Update charted to 0.4.8 and roll

packages/intl/test/date_time_format_file_odd_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-/**
- * Tests date formatting and parsing using locale data read from the
- * local file system. This tests one half the locales, since testing all
- * of them takes long enough that it may cause timeouts in the test bots.
- */
+/// Tests date formatting and parsing using locale data read from the
+/// local file system. This tests one half the locales, since testing all
+/// of them takes long enough that it may cause timeouts in the test bots.
 
+@Timeout(const Duration(seconds: 60))
 library date_time_format_file_test_1;
 
 import 'date_time_format_test_stub.dart';
 import 'data_directory.dart';
 import 'package:intl/date_symbol_data_file.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 main() {
-  unittestConfiguration.timeout = new Duration(seconds: 60);
   runWith(oddLocales, dataDirectory, initializeDateFormatting);
 }