Use minor level for Python image instead of patch level

[dbeatty10]

Describe the feature

Use Python 3.9 (or better yet 3.11) instead of 3.9.9 here:

dbt-codegen/.circleci/config.yml

Line 6 in 5caf2e3

- image: cimg/python:3.9.9

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Is this feature database-specific? Which database(s) is/are relevant? Please include any other relevant context here.

Who will this benefit?

What kind of use case will this feature be useful for? Please be specific and provide examples, this will help us prioritize properly.

Are you interested in contributing this feature?

[dbeatty10]

Resolved by #215