Use Ruff instead of flake8

[HannesHasselbring]

• fix mypy config for pre-commit and the project
• format all files with black

[coveralls]

Coverage: 91.571% (-0.01%) from 91.582% when pulling 42fa91e6f835b8c6cf66da952beba536881eb68a on HannesHasselbring:ruff into ae07f4942224832fae2da6dec587b5c62a06954b on eruvanos:main.