chore: add a line (#19170)

Adds back a line to the changelog that I erroneously deleted.

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: kaizencc

CHANGELOG.v2.md

@@ -17,6 +17,7 @@ All notable changes to this project will be documented in this file. See [standa
 * **pipelines:** step outputs ([#19024](https://github.com/aws/aws-cdk/issues/19024)) ([0dec2ee](https://github.com/aws/aws-cdk/commit/0dec2ee78a70832c3a697be26c67498460a587dd)), closes [#17189](https://github.com/aws/aws-cdk/issues/17189) [#18893](https://github.com/aws/aws-cdk/issues/18893) [#15943](https://github.com/aws/aws-cdk/issues/15943) [#16407](https://github.com/aws/aws-cdk/issues/16407)
 * **rds:** make VPC optional for serverless Clusters ([#17413](https://github.com/aws/aws-cdk/issues/17413)) ([4f7818d](https://github.com/aws/aws-cdk/commit/4f7818dd76bd48ed652407f4852cc97ba57d7395)), closes [#17401](https://github.com/aws/aws-cdk/issues/17401)
 
+
 ### Bug Fixes
 
 * **cli:** hotswapping is slow for many resources deployed at once ([#19081](https://github.com/aws/aws-cdk/issues/19081)) ([040238e](https://github.com/aws/aws-cdk/commit/040238e9285945d1c48ef79474e527b871e7824c)), closes [#19021](https://github.com/aws/aws-cdk/issues/19021)