Update for Python 3.9 in 2023 #17
                
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Issue #, if available:
Keeping the lights on for this repo.
Description of changes:
This PR is created in April 2023. Python 3.7 will be EOL in June 2023. This PR contains the changes in #15, which needs to be merged; the lambda code block has improper indentation and will not run. I'm not sure whether this CFT is also supposed to configure a s3 trigger for the lambda, I've only executed the lambda by invoking the lambda manually with no parameters
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