Update CHANGELOG.md

Author: vmarta

packages/commerce-sdk-react/CHANGELOG.md

@@ -1,6 +1,4 @@
 ## v4.0.0-dev.1 (Aug 28, 2025)
-## v4.0.0-dev (Aug 28, 2025)
-## v3.12.0-dev.1 (Aug 28, 2025)
 ## v4.0.0-dev (Aug 18, 2025)
 - Upgrade to commerce-sdk-isomorphic v4.0.0 [2879](https://github.com/SalesforceCommerceCloud/pwa-kit/pull/2879)
 - Add support for environment level base paths on /mobify routes [#2892](https://github.com/SalesforceCommerceCloud/pwa-kit/pull/2892)