Merge branch '5.0' into 5.1

* 5.0:
  Parse and render anonymous classes correctly on php 8
  Enable APCu for the php 8 build.
  [Process] Fix failing test on php 8.
  [HttpKernel] fix test
  Make PHP 8 green on Travis
  Revert "[Cache] allow DBAL v3"
  [PropertyAccessor] Added missing property path on php 8.
  Don't execute tests with DBAL 2.x on php 8.

Author: nicolas-grekas

Normalizer/AbstractObjectNormalizer.php

@@ -237,7 +237,7 @@ protected function instantiateObject(array &$data, string $class, array &$contex
      *
      * @return string[]
      */
-    protected function getAttributes($object, string $format = null, array $context)
+    protected function getAttributes($object, ?string $format, array $context)
     {
         $class = $this->objectClassResolver ? ($this->objectClassResolver)($object) : \get_class($object);
         $key = $class.'-'.$context['cache_key'];

Tests/Normalizer/GetSetMethodNormalizerTest.php

@@ -603,7 +603,7 @@ class GetConstructorArgsWithDefaultValueDummy
     protected $foo;
     protected $bar;
 
-    public function __construct($foo = [], $bar)
+    public function __construct($foo = [], $bar = null)
     {
         $this->foo = $foo;
         $this->bar = $bar;

Tests/Normalizer/ObjectNormalizerTest.php

@@ -784,7 +784,7 @@ class ObjectConstructorArgsWithDefaultValueDummy
     protected $foo;
     protected $bar;
 
-    public function __construct($foo = [], $bar)
+    public function __construct($foo = [], $bar = null)
     {
         $this->foo = $foo;
         $this->bar = $bar;
@@ -934,7 +934,7 @@ class DummyWithConstructorObjectAndDefaultValue
     private $foo;
     private $inner;
 
-    public function __construct($foo = 'a', ObjectInner $inner)
+    public function __construct($foo = 'a', ObjectInner $inner = null)
     {
         $this->foo = $foo;
         $this->inner = $inner;