Bug with numpy 2.x

Change this [line](https://github.com/msaifee786/hvf_extraction_script/blob/6f2765f99eb8c9d6ed68a0fe2f6e7f5571b45c26/hvf_extraction_script/hvf_data/hvf_plot_array.py#L514):

from
```python
                sum_pixels = sum(plot_image[row_index, x_start:x_end])
```

to

```python
                sum_pixels = np.sum(plot_image[row_index, x_start:x_end])
```

it will work with `numpy 2.x`.