aws-ecs: Update Lambda Runtime Version for instance-drain-hook.ts

[its-felix]

Describe the feature

The instance-drain-hook Lambda uses the Python 3.9 Runtime (https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-ecs/lib/drain-hook/instance-drain-hook.ts#L65) which is being deprecated on Dec 15, 2025 (https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html).

Use Case

Updating before its too late

Proposed Solution

Update to latest Python Runtime

Other Information

No response

Acknowledgements

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

AWS CDK Library version (aws-cdk-lib)

2.200.1

AWS CDK CLI version

latest

Environment details (OS name and version, etc.)

N/A

[ykethan]

Hey @its-felix, thank you for filing this feature request and interest in implementing this update. Do refer to the contributing guidelines for information.
Marking as P2

[its-felix]

@ykethan how do I get a review on the PR?

[related-issues-bot-for-aws]

Hi @its-felix,

Thanks for reporting! This appears to be a duplicate issue. If you feel this is a distinct issue, please let us know in the comments. Otherwise, we'll close this ticket in 7 days and encourage you to follow the conversation threads in the potential duplicates listed below ranked by engagement.

Potential Duplicate Issues

• aws-ecs: update the runtime used by InstanceDrainHook to 3.10 or later #34928: Both issues address the identical problem of updating the instance-drain-hook Lambda in aws-ecs from Python 3.9 runtime (which is being deprecated on Dec 15, 2025) to a newer Python runtime version. Both target the exact same line of code in instance-drain-hook.ts (line 65) and propose the same solution of upgrading to a newer Python runtime.

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