removed stray references to attrs package

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.28%. Comparing base (2d4116a) to head (dedad1d). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #93 +/- ## ========================================== - Coverage 92.29% 92.28% -0.01% ========================================== Files 47 47 Lines 5332 5330 -2 Branches 481 480 -1 ========================================== - Hits 4921 4919 -2 Misses 304 304 Partials 107 107 ```

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