Merge branch '4.2'

* 4.2:
  [Serializer] fixed DateTimeNormalizer to maintain microseconds when a different timezone required
  [Routing] fix taking verb into account when redirecting
  [TwigBundle] Sync tab navigation css
  [WebProfilerBundle] Fix log filter in dark mode
  [WebProfilerBundle][4.2] Deny messenger <4.2
  [DI] Fix dumping expressions accessing single-use private services
  [VarExporter] fix dumping protected property from abstract classes
  [WebProfilerBundle] Split form field heading
  Minor tweak for c3ad8a5

Author: nicolas-grekas

Tests/DependencyInjection/Fixtures/php/messenger_transports.php

@@ -3,7 +3,7 @@
 $container->loadFromExtension('framework', array(
     'serializer' => true,
     'messenger' => array(
-        'serializer' => 'serializer: messenger.transport.symfony_serializer',
+        'serializer' => 'messenger.transport.symfony_serializer',
         'transports' => array(
             'default' => 'amqp://localhost/%2f/messages',
             'customised' => array(