Fix pytest problem from pyarrow dependency in pandas

[cchwala]

• [x] closes #13

[codecov[bot]]

Codecov Report

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

Comparison is base (82ecf4a) 100.00% compared to head (20c7de9) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #14 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 2 2 Lines 20 20 ========================================= Hits 20 20 ```

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