Releasing 3.9.0.

Author: cyrilverloop

CHANGELOG.md

@@ -4,7 +4,7 @@ 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]
+## [3.9.0] - 2025-03-31
 ### Changed
 - sinon 19.0.2 => 20.0.0.
 - cyril-verloop/codingame-configuration 1.12.0 => 1.13.3.