N°8834 - Add compatibility with PHP 8.4 (#819)

* N°8834 - Add compatibility with PHP 8.4

* Rollback of scssphp/scssphp version upgrade due to compilation error

lib/symfony/cache/Traits/CachedValueInterface.php

@@ -0,0 +1,20 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Cache\Traits;
+
+/**
+ * @internal
+ */
+interface CachedValueInterface
+{
+    public function getValue(): mixed;
+}