docs(changelog): update release notes

CHANGELOG.md

@@ -1,5 +1,22 @@
 # CHANGELOG
 
+## [v2.21.0](https://github.com/Checkmarx/ast-vscode-extension/releases/tag/v2.21.0) - 2024-09-25 07:09:55
+
+<!-- Release notes generated using configuration in .github/release.yml at v2.21.0 -->
+
+## What's Changed
+### Bug Fixes 🐛
+* Changelog and prereleases should appear in vscode (AST-66013) by @elchananarb in https://github.com/Checkmarx/ast-vscode-extension/pull/952
+### Other Changes
+* Itay feature: Show SCS results include group by and Filter and Vulnerability Tab (AST-63908) by @Korjen97 in https://github.com/Checkmarx/ast-vscode-extension/pull/946
+* Update Vorpal Name to ASCA(AST-65647) by @miryamfoiferCX in https://github.com/Checkmarx/ast-vscode-extension/pull/955
+* Update Version - Automated Changes by @pedrompflopes in https://github.com/Checkmarx/ast-vscode-extension/pull/958
+
+## New Contributors
+* @miryamfoiferCX made their first contribution in https://github.com/Checkmarx/ast-vscode-extension/pull/955
+
+**Full Changelog**: https://github.com/Checkmarx/ast-vscode-extension/compare/v2.20.0...v2.21.0
+
 ## [v2.20.1-2.20.0-asca.0](https://github.com/Checkmarx/ast-vscode-extension/releases/tag/v2.20.1-2.20.0-asca.0) - 2024-09-24 08:50:40
 
 <!-- Release notes generated using configuration in .github/release.yml at main -->