chore: update changelog to include python 3.11 update (#31346)

### Issue # (if applicable)

N/A

### Reason for this change

Add missing changelog since the original PR was titled as `chore` but should have been `feat`.

### Description of changes

Update changelog.md

### Description of how you validated changes

Viewed the changelog.md file and looks fine.

### Checklist
- [ ] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

CHANGELOG.v2.md

@@ -15,7 +15,7 @@ All notable changes to this project will be documented in this file. See [standa
 * **eks:** support alb controller versions 2.7.0-2.8.2 ([#31264](https://github.com/aws/aws-cdk/issues/31264)) ([a3863a6](https://github.com/aws/aws-cdk/commit/a3863a6b5607dd462b3774f01f21d9dea4fd15d5))
 * **events-targets:** support for `RedshiftDataParameters` ([#29462](https://github.com/aws/aws-cdk/issues/29462)) ([84c6442](https://github.com/aws/aws-cdk/commit/84c6442d6a4253472df1fee5589f154590bae182)), closes [#15712](https://github.com/aws/aws-cdk/issues/15712) [#31017](https://github.com/aws/aws-cdk/issues/31017)
 * **synthetics:** syn-nodejs-puppeteer-9.0 as supported runtime ([#31272](https://github.com/aws/aws-cdk/issues/31272)) ([c1d7782](https://github.com/aws/aws-cdk/commit/c1d778254346aea444ae844a17d0cab296cce4bb)), closes [#31271](https://github.com/aws/aws-cdk/issues/31271)
-
+* **custom-resources:** update python runtime for custom resources  ([#31166](https://github.com/aws/aws-cdk/pull/31166)) ([03ebca8](https://github.com/aws/aws-cdk/commit/03ebca8a9768b6415e6942893e0310ac412d4b80)), closes [#31245](https://github.com/aws/aws-cdk/issues/31245)
 
 ### Bug Fixes