Bump PHP SDK to 2.5.1

Author: romainneutron

Diff for: CHANGELOG

@@ -1,6 +1,10 @@
 CHANGELOG
 =========
 
+* v2.5.1 (2024-05-13)
+
+  - Remove documentation about samples feature
+
 * v2.5.0 (2024-05-03)
 
   - Deprecate the "samples" option

Diff for: src/Blackfire/Client.php

@@ -27,7 +27,7 @@ class Client
 {
     const MAX_RETRY = 60;
     const NO_REFERENCE_ID = '00000000-0000-0000-0000-000000000000';
-    const VERSION = '2.5.0';
+    const VERSION = '2.5.1';
 
     private $config;
     private $collabTokens;