small edit of notebooks/sbi.ipynb to correct the URL for CAMELS data

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Codecov Report

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

Project coverage is 96.89%. Comparing base (12efd32) to head (1e0e2b4). Report is 1 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #170 +/- ## ========================================== - Coverage 96.95% 96.89% -0.07% ========================================== Files 23 23 Lines 1644 1644 ========================================== - Hits 1594 1593 -1 - Misses 50 51 +1 ```

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