bump version 0.21.0 for charts

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/16512488175

Upstream-Ref: Automattic/jetpack@34904d1

Author: kangzj

CHANGELOG.md

@@ -5,16 +5,13 @@ 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).
 
-## [0.21.0-alpha] - unreleased
-
-This is an alpha version! The changes listed here are not final.
-
+## [0.21.0] - 2025-07-25
 ### Added
-- Add Storybook docs introduction
+- Add Storybook docs introduction [#44427]
 
 ### Changed
-- Fix export structure for charts
-- Removed src and tests to optimize lib size
+- Fix export structure for charts [#44440]
+- Removed src and tests to optimize lib size [#44438]
 
 ## [0.20.0] - 2025-07-23
 ### Added
@@ -319,7 +316,7 @@ This is an alpha version! The changes listed here are not final.
 - Fixed lints following ESLint rule changes for TS [#40584]
 - Fixing a bug in Chart storybook data. [#40640]
 
-[0.21.0-alpha]: https://github.com/Automattic/charts/compare/v0.20.0...v0.21.0-alpha
+[0.21.0]: https://github.com/Automattic/charts/compare/v0.20.0...v0.21.0
 [0.20.0]: https://github.com/Automattic/charts/compare/v0.19.1...v0.20.0
 [0.19.1]: https://github.com/Automattic/charts/compare/v0.19.0...v0.19.1
 [0.19.0]: https://github.com/Automattic/charts/compare/v0.18.0...v0.19.0