Fix CHANGELOG.md (#1244)

Fixed a mistake in the year notation in Markdown.

Author: NoahHahm

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).
 
-## [7.21.0] - 2024-07-23
+## [7.21.0] - 2025-07-23
 
 ### Added