sfn-glue-sync-cdk: Update aws-cdk-lib and replace deprecated Python shell 3.6 with 3.9

[kakakakakku]

Issue #, if available:
N/A

Description of changes:
Hi😀 Thanks for the useful patterns!

To keep this pattern maintainable, I updated the aws-cdk-lib.

Check

cdk deploy completed successfully and works good.

$ aws stepfunctions start-execution --state-machine-arn "arn:aws:states:ap-northeast-1:000000000000:stateMachine:GlueJobStateMachineE759615B-at44lw4ZXLFV" --input "{\"message\": \"Hello from sfn glue step\"}"
{
    "executionArn": "arn:aws:states:ap-northeast-1:000000000000:execution:GlueJobStateMachineE759615B-at44lw4ZXLFV:132bb420-2b55-4fa4-9085-63a0e226e2d7",
    "startDate": "2026-07-06T23:55:20.379000+09:00"
}

Thank you😀

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[marcojahn]

Hello @kakakakakku , thank you for your maintenance contribution to this pattern. It will be merged soon.