Merge branch '5.3' into 5.4

* 5.3:
  [FrameworkBundle] Fix default PHP attributes support in validation and serializer configuration when doctrine/annotations is not installed with PHP 8

Author: nicolas-grekas

DependencyInjection/Configuration.php

@@ -884,7 +884,7 @@ private function addValidationSection(ArrayNodeDefinition $rootNode, callable $e
                     ->{$enableIfStandalone('symfony/validator', Validation::class)}()
                     ->children()
                         ->scalarNode('cache')->end()
-                        ->booleanNode('enable_annotations')->{!class_exists(FullStack::class) && $willBeAvailable('doctrine/annotations', Annotation::class, 'symfony/validator') ? 'defaultTrue' : 'defaultFalse'}()->end()
+                        ->booleanNode('enable_annotations')->{!class_exists(FullStack::class) && (\PHP_VERSION_ID >= 80000 || $willBeAvailable('doctrine/annotations', Annotation::class, 'symfony/validator')) ? 'defaultTrue' : 'defaultFalse'}()->end()
                         ->arrayNode('static_method')
                             ->defaultValue(['loadValidatorMetadata'])
                             ->prototype('scalar')->end()
@@ -967,8 +967,8 @@ private function addValidationSection(ArrayNodeDefinition $rootNode, callable $e
 
     private function addAnnotationsSection(ArrayNodeDefinition $rootNode, callable $willBeAvailable)
     {
-        $doctrineCache = $willBeAvailable('doctrine/cache', Cache::class, 'doctrine/annotation');
-        $psr6Cache = $willBeAvailable('symfony/cache', PsrCachedReader::class, 'doctrine/annotation');
+        $doctrineCache = $willBeAvailable('doctrine/cache', Cache::class, 'doctrine/annotations');
+        $psr6Cache = $willBeAvailable('symfony/cache', PsrCachedReader::class, 'doctrine/annotations');
 
         $rootNode
             ->children()
@@ -993,7 +993,7 @@ private function addSerializerSection(ArrayNodeDefinition $rootNode, callable $e
                     ->info('serializer configuration')
                     ->{$enableIfStandalone('symfony/serializer', Serializer::class)}()
                     ->children()
-                        ->booleanNode('enable_annotations')->{!class_exists(FullStack::class) && $willBeAvailable('doctrine/annotations', Annotation::class, 'symfony/serializer') ? 'defaultTrue' : 'defaultFalse'}()->end()
+                        ->booleanNode('enable_annotations')->{!class_exists(FullStack::class) && (\PHP_VERSION_ID >= 80000 || $willBeAvailable('doctrine/annotations', Annotation::class, 'symfony/serializer')) ? 'defaultTrue' : 'defaultFalse'}()->end()
                         ->scalarNode('name_converter')->end()
                         ->scalarNode('circular_reference_handler')->end()
                         ->scalarNode('max_depth_handler')->end()