Update CHANGELOG.v2.alpha.md

Author: moelasmar

CHANGELOG.v2.alpha.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
-### [2.139.1-alpha.0](https://github.com/aws/aws-cdk/compare/v2.139.0-alpha.0...v2.139.1-alpha.0) (2024-04-29)
+## [2.139.1-alpha.0](https://github.com/aws/aws-cdk/compare/v2.139.0-alpha.0...v2.139.1-alpha.0) (2024-04-29)
 
 ## [2.139.0-alpha.0](https://github.com/aws/aws-cdk/compare/v2.138.0-alpha.0...v2.139.0-alpha.0) (2024-04-24)