fix(lambda): add @deprecated tag to python3.8

[kdnakt]

Issue # (if applicable)

Closes #.

Reason for this change

Updated according to this document.

Description of changes

Description of how you validated changes

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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

[aws-cdk-automation]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32162   +/-   ##
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  Coverage        ?   77.19%           
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  Files           ?      105           
  Lines           ?     7164           
  Branches        ?     1311           
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  Hits            ?     5530           
  Misses          ?     1454           
  Partials        ?      180           

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suite.unit	77.19% <ø> (?)

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 31e1d04
• Result: SUCCEEDED
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[kdnakt]

Exemption Request: this pr updates only documentation comment, so no changes for the test.

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Fixes must contain a change to a test file.
❌ Fixes must contain a change to an integration test file and the resulting snapshot.

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