Update package for 2023, move to ruff for formatting, remove seaborn import styling side effect fixes #205

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (0a592ab) 57.25% compared to head (7786d08) 57.15%. Report is 2 commits behind head on master.

Files	Patch %	Lines
ffn/core.py	82.60%	4 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #206 +/- ## ========================================== - Coverage 57.25% 57.15% -0.10% ========================================== Files 4 4 Lines 1165 1160 -5 Branches 249 249 ========================================== - Hits 667 663 -4 + Misses 434 433 -1 Partials 64 64 ```

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