Format with ruff

[palto42]

As a next step for #84, this PR replaces the tool black with ruff. The maximum line length has been increased to 120.
The poetry lock file has been updated as well.

The files with modifications other than format changes are

• README.md
• poetry.lock
• pyproject.toml
• .devcontainer/Dockerfile
• .devcontainer/devcontainer.json
• .travis.yml
• .vscode/settings.json

The actual soucre code and tests have not been modified except reformatting them with ruff.

[andreasnuesslein]

@palto42 why did you increase the line length to 120? I mean, I know "why", but are the "new developments" in the best practices? I agree that 88 seems restrictive but at the same time, when i open split view for 4 columns of editor tabs, 88 is not bad.

[palto42]

@andreasnuesslein The reason why I suggest to increase the max line length is that it's meanwhile quite common to use 120 char limit. In my view it makes the code more readable with a bit less line breaks. cookiecutter-uv which I suggest to use as template for the target project layout uses 120 as default and also Pycharm defaults to 120. At the end it's maybe just personal preference.

If you prefer to stick with old length, I can change it back to 88.