Describe the feature

Add support for Aurora postgres version 12.9 and other latest version in CDK construct
https://github.com/aws/aws-cdk/blob/master/packages/%40aws-cdk/aws-rds/lib/cluster-engine.ts#L491

Use Case

We need to upgrade Aurora cluster as 12.9 is the only LTS supported by AWS for Aurora 12, we want to target that. All our stacks are currently using 12.4 and written in CDK.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

V1

Environment details (OS name and version, etc.)

Mac/Linux