Update session key generation in SessionStorage

This commit changes how session keys are generated in SessionStorage. Instead of using a static value, a hash of the item's public key credential challenge is added to the session parameter to create a unique key. This enhancement should improve session data security.

src/symfony/src/Security/Storage/SessionStorage.php

@@ -23,7 +23,11 @@ public function __construct(
     public function store(Item $item, string|null $tag = null): void
     {
         $session = $this->requestStack->getSession();
-        $key = sprintf('%s-%s', self::SESSION_PARAMETER, hash('xxh128', $item->getPublicKeyCredentialOptions()->challenge));
+        $key = sprintf(
+            '%s-%s',
+            self::SESSION_PARAMETER,
+            hash('xxh128', $item->getPublicKeyCredentialOptions()->challenge)
+        );
         $session->set($key, [
             'options' => $item->getPublicKeyCredentialOptions(),
             'userEntity' => $item->getPublicKeyCredentialUserEntity(),