refactor: use plum type_unparametric

[codecov[bot]]

Codecov Report

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

Project coverage is 89.52%. Comparing base (bd9a7d2) to head (36682dc).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #135 +/- ## ========================================== - Coverage 89.58% 89.52% -0.07% ========================================== Files 25 24 -1 Lines 1316 1308 -8 ========================================== - Hits 1179 1171 -8 Misses 137 137 ```

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