fix: Use Python 3.8 for Drain Hook.

[safonovklim]

---

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[gitpod-io]

[safonovklim]

👀

Hello,

We are contacting you as we have identified that your AWS Account currently has one or more Lambda functions using Python 3.6 runtime.

We are ending support for Python 3.6 in AWS Lambda. This follows Python 3.6 End-Of-Life (EOL) reached on December 23, 2021 [1].

As described in the Lambda runtime support policy [2], end of support for language runtimes in Lambda happens in two stages. Starting July 18, 2022, Lambda will no longer apply security patches and other updates to the Python 3.6 runtime used by Lambda functions, and functions using Python 3.6 will no longer be eligible for technical support. In addition, you will no longer be able to create new Lambda functions using the Python 3.6 runtime. Starting August 17, 2022, you will no longer be able to update existing functions using the Python 3.6 runtime.

[kaizencc]

Thanks for opening this PR! This is being covered in #19988 so I'm going to close it as a duplicate. Hopefully you can monitor #19988 for when the update will be out.