Version 3.9.0 - Better handles

Changes

• Feedforward - change cursor on hover @amolenaar (#542)
• Update to Poetry 1.2.2, Enforce Python 3.9 as Minimum @danyeaw (#512)

🧰 Maintenance

• Move mypy.ini to pyproject.toml @danyeaw (#517)
• Fix typos and add codespell pre-commit hook @kianmeng (#521)

Thanks again to @amolenaar, @danyeaw, @dependabot, @dependabot[bot], @kianmeng, @pre-commit-ci, @pre-commit-ci[bot], @sourcery-ai and @sourcery-ai[bot]! 🎉