- Upgrade to Python 3.9 as a minimum
- Upgrade pillow because of security alerts. This required some API
changes and update of test result images
- The behaviour of the `LogCaptureFixture` changed, requiring changes
from `logging.info` to `logger.info`
- Downgraded `black` from 23 to 22 because of version constraints
- Changes in calls to `WorkflowParams` because of `mypy` issues that
were not detected until now
- `hi-ml-azure` now also has its own minimal Conda dev environment