chore: update changelog for version 4.2.0

Author: niftyvictor

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
 
-## Unreleased changes
+## [4.2.0] - 2025-07-29
 
 - Added support for listing and removing WebAuthn credentials for a user. New APIs":
   -   `POST /{apiBasePath}/<tenantId>/webauthn/credential/remove`