fix ruff issues

[joamatab]

Summary by Sourcery

Bug Fixes:

• Fix missing parameter documentation for 'fig' in the plot_model function.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the docstring of the plot_model function in the SAX plotting module by adding documentation for the fig parameter.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added missing parameter documentation in docstring	Added documentation for the 'fig' parameter which represents a matplotlib figure	gplugins/sax/plot_model.py

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