Update download urls for test_dataset.py

[codecov[bot]]

Codecov Report

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

Comparison is base (50092e6) 92.79% compared to head (a4a60d6) 92.77%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #96 +/- ## ========================================== - Coverage 92.79% 92.77% -0.03% ========================================== Files 20 20 Lines 7679 7679 ========================================== - Hits 7126 7124 -2 - Misses 553 555 +2 ```

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[rogerwwww]

Nice work! Merged