chore(aws-ecs): update python version on InstanceDrainHook handler

[Imamachi-n]

General Issue

• Lambda is configured with 3.6 version which has reached the EOF and will not longer be supported soon.
  • https://docs.aws.amazon.com/lambda/latest/dg/runtime-support-policy.html

Documentation

• A hook to drain instances from ECS traffic is implemented in Python 3.6.
• The code is under lib/drain-hook and unit tests are under test/ec2.

Resolution

• Need to update the Lambda Python version having more than 3.6 (Python 3.7)

Environment

• CDK Version: 2.20.0 / 1.152.0

---

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New Features

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  • Did you use yarn integ to deploy the infrastructure and generate the snapshot (i.e. yarn integ without --dry-run)?

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

[gitpod-io]

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
• Commit ID: 2269fff
• Result: SUCCEEDED
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[kaizencc]

Thanks for opening this PR! We're going to catch all of these in #19988 I believe. Sorry, I know yours came first but we want to update them all at the same time and to the latest runtime.