[FSSDK-12610] chore: Prepare release 4.0.3 (#297)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: Tamara-Barum

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Optimizely PHP SDK Changelog
 
+## 4.0.3
+May 20, 2026
+
+* Fix: PHP 8.4 implicit nullable parameter deprecation warnings #296
+* Security: Fix curl|bash vulnerability in SourceClear scan #294
+
 ## 4.0.2
 March 14, 2025
 

src/Optimizely/Event/Builder/EventBuilder.php

@@ -39,7 +39,7 @@ class EventBuilder
     /**
      * @const string Version of the Optimizely PHP SDK.
      */
-    const SDK_VERSION = '4.0.2';
+    const SDK_VERSION = '4.0.3';
 
     /**
      * @var string URL to send event to.

tests/EventTests/EventBuilderTest.php

@@ -69,7 +69,7 @@ protected function setUp() : void
                 ]],
                 'revision' => '15',
                 'client_name' => 'php-sdk',
-                'client_version' => '4.0.2',
+                'client_version' => '4.0.3',
                 'anonymize_ip'=> false,
                 'enrich_decisions' => true,
             ];