Fix cupy rng.normal syntax to standard_normal

[codecov[bot]]

Codecov Report

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

Comparison is base (3f90cb1) 92.38% compared to head (d2cc04a) 92.37%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #39 +/- ## ========================================== - Coverage 92.38% 92.37% -0.01% ========================================== Files 28 28 Lines 2035 2034 -1 ========================================== - Hits 1880 1879 -1 Misses 155 155 ```

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