Merge branch '5.0' into 5.1

* 5.0:
  fix merge
  Require PHPUnit 9.3 on PHP 8
  [Cache] fix catching auth errors
  Fix CS
  [FrameworkBundle] set default session.handler alias if handler_id is not provided
  Fix CS
  Readability update
  Fix checks for phpunit releases on Composer 2 (resolves #37601)
  [Serializer] Support multiple levels of discriminator mapping
  Use hexadecimal numerals instead of hexadecimals in strings to represent error codes.
  [SCA] Minor fixes on tests
  [WebProfilerBundle] modified url generation to use absolute urls
  [Mailer] Fix reply-to functionality in the SendgridApiTransport
  [Mime] Fix compat with HTTP requests
  ticket_36879 - Fix mandrill raw http request setting from email/name

Author: nicolas-grekas

DependencyInjection/FrameworkExtension.php

@@ -956,6 +956,7 @@ private function registerSessionConfiguration(array $config, ContainerBuilder $c
             // Set the handler class to be null
             $container->getDefinition('session.storage.native')->replaceArgument(1, null);
             $container->getDefinition('session.storage.php_bridge')->replaceArgument(0, null);
+            $container->setAlias('session.handler', 'session.handler.native_file')->setPrivate(true);
         } else {
             $container->resolveEnvPlaceholders($config['handler_id'], null, $usedEnvs);
 

Tests/DependencyInjection/FrameworkExtensionTest.php

@@ -503,6 +503,7 @@ public function testNullSessionHandler()
         $this->assertTrue($container->hasDefinition('session'), '->registerSessionConfiguration() loads session.xml');
         $this->assertNull($container->getDefinition('session.storage.native')->getArgument(1));
         $this->assertNull($container->getDefinition('session.storage.php_bridge')->getArgument(0));
+        $this->assertSame('session.handler.native_file', (string) $container->getAlias('session.handler'));
 
         $expected = ['session', 'initialized_session', 'logger'];
         $this->assertEquals($expected, array_keys($container->getDefinition('session_listener')->getArgument(0)->getValues()));