Use newer Python versions in CI pipeline in episode 6
requested to merge 8-episode-6-use-newer-python-versions-in-ci-pipline into 6-optimizing-the-pipeline
- Use Python versions 3.9, 3.10, 3.11 to run and test the Python app in the CI pipeline.
- Set minimum Python version to 3.9.
Relates to #8 (closed)