Update changelogs for v0.21.4 release

GitOrigin-RevId: 1741cf5502c5a788d9994671e1567cc6ae18d29e

Author: github-actions[bot]

CHANGELOG.md

@@ -20,6 +20,9 @@ Mapbox welcomes participation and contributions from everyone.
 ## 11.22.0-rc.1 - 08 April, 2026
 
 * Fix old 3D puck model remaining after updating the puck model.
+
+## 11.21.4 - 05 May, 2026
+
 ## 11.21.3 - 23 April, 2026
 
 ## 11.21.2 - 16 April, 2026