Switch to python 3.11

[rajeee]

Pull Request Description

Black stopped supporting python 3.8: https://github.com/psf/black/pull/4452. We can do the same as well, and make BSB use python 3.11 with support for 3.12. This allows us to use features introduced in later python version such as the union operator on dict and fine-grained error location.

Checklist

Not all may apply

• [ ] Code changes (must work)
• [ ] Tests exercising your feature/bug fix (check coverage report on Checks -> BuildStockBatch Tests -> Artifacts)
• [ ] Coverage has increased or at least not decreased. Update minimum_coverage in .github/workflows/coverage.yml as necessary.
• [ ] All other unit and integration tests passing
• [ ] Update validation for project config yaml file changes
• [ ] Update existing documentation
• [ ] Run a small batch run on Kestrel/Eagle to make sure it all works if you made changes that will affect Kestrel/Eagle
• [ ] Add to the changelog_dev.rst file and propose migration text in the pull request

[rajeee]

Alternatively we could drop support for python 3.8 altogether and add support for 3.12. I'm able to run on 3.12, but it gives some warnings.

I considered doing that but remembered your reservation about dropping 3.8 because some part of BSB AWS needing to run inside the openstudio container.