build: Disable build cache for Python tests

[codecov[bot]]

Codecov Report

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

Project coverage is 89.70%. Comparing base (cd0b70a) to head (5d284ed).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #477 +/- ## ======================================= Coverage 89.70% 89.70% ======================================= Files 57 57 Lines 9643 9643 ======================================= Hits 8650 8650 Misses 993 993 ```

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