Update Python version

[maneesha]

The instructions say to use Python >= 3.9. However, version 3.9 hit EOL on 2025-10-31. Should we say >= 3.10? Should we recommend the newest version whenever possible?

[froggleston]

The newest version of Python usually comes with more issues due to downstream libraries needing to update if anything in the core language changes. I'd recommend doing the oldest supported version to the version one below the most recent, i.e. 3.10 -> 3.13