chore: update version to 1.21.3 and enhance changelog with addSettings method update

Author: harshithad0703

CHANGELOG.md

@@ -1,8 +1,11 @@
 # Changelog
+## [v1.21.3](https://github.com/contentstack/contentstack-management-javascript/tree/v1.21.3) (2025-05-26)
+ - Enhancement
+   - Update addSettings Method to Support Generic Stack Settings Update
+
 ## [v1.21.2](https://github.com/contentstack/contentstack-management-javascript/tree/v1.21.2) (2025-05-19)
  - Enhancement
    - Added preview token generation.
-   - Update addSettings Method to Support Generic Stack Settings Update
 
 ## [v1.21.1](https://github.com/contentstack/contentstack-management-javascript/tree/v1.21.1) (2025-05-12)
  - Fix

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@contentstack/management",
-  "version": "1.21.2",
+  "version": "1.21.3",
   "description": "The Content Management API is used to manage the content of your Contentstack account",
   "main": "./dist/node/contentstack-management.js",
   "browser": "./dist/web/contentstack-management.js",