Bump version to 4.0.3 and changelog.md file changes (apigee#464)

* Bump version to 4.0.3 and changelog.md file changes

* added new PR change in changelog.md file

Author: shailesh-google

CHANGELOG.md

@@ -1,4 +1,10 @@
 # CHANGELOG
+## [4.0.3](https://github.com/apigee/apigee-client-php/milestone/39?closed=1)
+* [#457] Upgrade Symfony dependencies to v7.3.
+* [#455] support new firebase/php-jwt ^7.0 version.
+* [#461] Override testIgnoreVoidAccessor method.
+* [#462] Resolved Developer test failure and Upgrade Symfony components to 7.4.
+
 ## [4.0.2](https://github.com/apigee/apigee-client-php/milestone/36?closed=1)
 * [#447] Support to update AppGroup app credential scope object.
 

src/ClientInterface.php

@@ -63,7 +63,7 @@ interface ClientInterface extends HttpClient
      */
     public const APIGEE_ON_GCP_ENDPOINT = 'https://apigee.googleapis.com/v1';
 
-    public const VERSION = '4.0.2';
+    public const VERSION = '4.0.3';
 
     /**
      * Allows access to the last request, response and exception.