Issue #3392616 by Spokje, longwave: Update to Symfony 6.4

composer.json

composer.lock

composer/Metapackage/CoreRecommended/composer.json

composer/Metapackage/DevDependencies/composer.json

composer/Metapackage/PinnedDevDependencies/composer.json

core/.deprecation-ignore.txt

core/composer.json

core/lib/Drupal/Component/DependencyInjection/composer.json

core/lib/Drupal/Component/EventDispatcher/composer.json

core/lib/Drupal/Component/HttpFoundation/composer.json

core/lib/Drupal/Component/Plugin/composer.json

core/lib/Drupal/Component/Serialization/composer.json

core/phpstan-baseline.neon

...dTests/Composer/Template/ComposerProjectTemplatesTest.php