Nakama 3.22.0 release, update changelog.

Author: zyro

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to this project are documented below.
 The format is based on [keep a changelog](http://keepachangelog.com) and this project uses [semantic versioning](http://semver.org).
 
 ## [Unreleased]
+
+## [3.22.0] - 2024-06-09
 ### Added
 - Add runtime support for registering a shutdown hook function.
 - Add support to custom sorting in storage index search.