Update "format" Keyword in pyproject.toml to "output-format"

[Dridi-Hichem]

Issue:

The style in which violation messages are presented by Ruff is indicated by the keyword "format" inside pyproject.toml, as shown below:

[tool.ruff]
format = "grouped"

Previously, this configuration used to work in our template. However, recently, it causes a failure with the following error:

Cause: TOML parse error at line 126, column 10
        |
126  | format = "grouped"
        |
invalid type: string "grouped", expected struct FormatOptions

Upon investigating the documentation, I found that the correct keyword should be "output-format" instead of "format".

Proposal:

I suggest updating the configuration in pyproject.toml to reflect the correct keyword "output-format" as follows:

[tool.ruff]
output-format = "grouped"

This change should resolve the parsing error and align with the documentation's requirements.