Merge branch '4.4' into 5.0

* 4.4:
  Fix merge
  [DoctrineBridge] try to fix deprecations from doctrine/persistence
  [DI] Add support for immutable setters in CallTrait
  [Cache] Propagate expiry when syncing items in ChainAdapter
  Removed request header "Content-Type" from the preferred format guessing mechanism
  [Routing] fix memoryleak when loading compiled routes
  [Translation] fix memoryleak in PhpFileLoader
  fix triggering deprecation in file locator
  bug #34877 [TwigBundle] fix findTemplate() to return `null`

Author: nicolas-grekas

Cloner/AbstractCloner.php

@@ -46,6 +46,7 @@ abstract class AbstractCloner implements ClonerInterface
         'Doctrine\Common\Proxy\Proxy' => ['Symfony\Component\VarDumper\Caster\DoctrineCaster', 'castCommonProxy'],
         'Doctrine\ORM\Proxy\Proxy' => ['Symfony\Component\VarDumper\Caster\DoctrineCaster', 'castOrmProxy'],
         'Doctrine\ORM\PersistentCollection' => ['Symfony\Component\VarDumper\Caster\DoctrineCaster', 'castPersistentCollection'],
+        'Doctrine\Persistence\ObjectManager' => ['Symfony\Component\VarDumper\Caster\StubCaster', 'cutInternals'],
 
         'DOMException' => ['Symfony\Component\VarDumper\Caster\DOMCaster', 'castException'],
         'DOMStringList' => ['Symfony\Component\VarDumper\Caster\DOMCaster', 'castLength'],