Ruff --preview introduces differences

[mikekryjak]

The CI is set to --preview, which prefers:

        ds["pos"].attrs.update({
            "conversion": 1,
            "units": "m",
            "standard_name": "parallel position",
            "long_name": "Parallel connection length",
        })

over:

        ds["pos"].attrs.update(
            {
                "conversion": 1,
                "units": "m",
                "standard_name": "parallel position",
                "long_name": "Parallel connection length",
            }
        )

I don't have --preview in my local env, which results in formatting inconsistencies, e.g. in #28.
Is there a reason to use --preview? If we took it out, I think we would reduce the chances of conflicts, because probably most users wouldn't think to install the preview version.