fixing the linter, once again

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mostly broken by fusion_rings and lazy_rings recent tickets

Component: **refactoring**

Author: **Frédéric Chapoton**

Branch/Commit: **[`fdd4f7f`](https://github.com/sagemath/sagetrac-mirror/commit/fdd4f7f9f0b50a6718eb682d905557f2766f4b4f)**

Reviewer: **Matthias Koeppe, Lorenz Panny**

_Issue created by migration from https://trac.sagemath.org/ticket/34781_

