fix black linting

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 81.32%. Comparing base (cd3391d) to head (4b3b219).

Files	Patch %	Lines
dadapy/_utils/metric_comparisons.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #121 +/- ## ========================================== + Coverage 81.29% 81.32% +0.03% ========================================== Files 20 20 Lines 3299 3299 ========================================== + Hits 2682 2683 +1 + Misses 617 616 -1 ```

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