Bump Lambda runtime versions for Python 3.9 EOL

[DocEight]

Thanks for the project!

Since Python 3.9 will reach its EOL in 10/2025, I'm going to go ahead and raise some (super simple) PRs to bump the runtimes of the Lambda functions in this project to 3.10 and 3.13. I'll link to these PRs in this issue as soon as I've got them raised.

Please feel free to review these, and (should you so desire) merge whichever you see fit :) Thanks in advance!