[skip ci] Update changelogs for v0.21.3 release

GitOrigin-RevId: cabc2642c7c4e62e35f628146c8ae18b4193cede

Author: endanke

CHANGELOG.md

@@ -17,6 +17,8 @@ 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.
+## 11.21.3 - 23 April, 2026
+
 ## 11.21.2 - 16 April, 2026
 
 ## 11.21.1 - 10 April, 2026