Bump php-sdk to version v2.5.6

Author: julien-jean

CHANGELOG

@@ -1,6 +1,10 @@
 CHANGELOG
 =========
 
+* v2.5.6 (2025-01-10)
+
+  - [sdk] implement ProfileNotReadyException
+
 * v2.5.5 (2024-12-23)
 
   - Upgrade to PHP 8.4 to run functional tests

src/Blackfire/Client.php

@@ -28,7 +28,7 @@ class Client
 {
     const MAX_RETRY = 60;
     const NO_REFERENCE_ID = '00000000-0000-0000-0000-000000000000';
-    const VERSION = '2.5.2';
+    const VERSION = '2.5.6';
 
     private $config;
     private $collabTokens;