Bump python version to 3.11.6

What does this merge request do and why?

This bumps Python from 3.11.5 to 3.11.6 to ensure we are up-to-date with security patches.

For the full change-log https://docs.python.org/release/3.11.6/whatsnew/changelog.html#changelog

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Merge request checklist

• I've ran the eval_codebase.py pipeline to validate that nothing is broken.
• Tests added for new functionality. If not, please raise an issue to follow up.
• Documentation added/updated, if needed.