chore(tooling): change ruff format's flag from --diff to --check in tox.ini

[felix314159]

🗒️ Description

This PR replaces --diff with --check so that resulting print when everything is fine is not danger-red colored

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx --with=tox-uv tox -e lint,typecheck,spellcheck,markdownlint

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md. skipped
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

[danceratopz]

LGTM! Thanks for looking into this.

This solves the danger red for ruff 👍 (with no side-effects) but not for other commands, e.g., the output of mkdocs build --strict in the mkdocs tox env. I wonder if there's an option to tox that solves this in general.

Btw, I made this change in the mkdocs env too for consistentcy. I would never have spotted this in the scope of #1779 😉.

I'm already much more relaxed running tox, thanks for sorting this!