Describe the bug

Some existing integ tests within the aws-rds module fail to deploy because they were created with a postgres version that is now deprecated (version <=15.x) and fails with the following error

"Cannot find version 15.2 for postgres (Service: Rds, Status Code: 400, Request ID: 3aaada49-96f7-42bc-ae49-3674c11f56df)"

This is due to the existing snapshots already using the deprecated versions.

Expected Behavior

Should be able to deploy the integ test successfully.

Current Behavior

Fails with the following error

"Cannot find version 15.2 for postgres (Service: Rds, Status Code: 400, Request ID: 3aaada49-96f7-42bc-ae49-3674c11f56df)"

Reproduction Steps

Deploy one of the aws-rds integ tests that still uses a deprecated version of postgres (<=15.x).
i.e.

const parameterGroup = new rds.ParameterGroup(stack, 'ParameterGroup', {
  engine: rds.DatabaseInstanceEngine.postgres({ version: rds.PostgresEngineVersion.VER_15_2 }),
  ...
});

Possible Solution

The solution is to manually delete the corresponding snapshot folder for these tests and update the postgres version to a supported version (currently >=16.x) and rerun the integ test to generate the new snapshots.

Additional Information/Context

No response

CDK CLI Version

2.141.0

Framework Version

No response

Node.js Version

v21.7.1

OS

14.4.1

Language

TypeScript

Language Version

No response

Other information

No response