`standard_normal` sometimes produces `inf`

Per the title:
```python
import parallel_numpy_rng
import numpy as np
rng = parallel_numpy_rng.default_rng(1194)
a = rng.standard_normal(size=20000, nthread=16, dtype=np.float32)
print(np.all(np.isfinite(a)))  # False
```

Thanks to @SandyYuan for the report!