fixes for flake8 6.1

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and no project coverage change.

Comparison is base (934a351) 57.25% compared to head (9d759d0) 57.25%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #203 +/- ## ======================================= Coverage 57.25% 57.25% ======================================= Files 4 4 Lines 1165 1165 Branches 249 249 ======================================= Hits 667 667 Misses 434 434 Partials 64 64 ``` | [Files Changed](https://app.codecov.io/gh/pmorissette/ffn/pull/203?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [ffn/core.py](https://app.codecov.io/gh/pmorissette/ffn/pull/203?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZmZuL2NvcmUucHk=) | `59.72% <33.33%> (ø)` | | | [ffn/utils.py](https://app.codecov.io/gh/pmorissette/ffn/pull/203?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-ZmZuL3V0aWxzLnB5) | `56.94% <100.00%> (ø)` | |

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