Set dpi for images

### Discussed in https://github.com/spatie/laravel-medialibrary/discussions/3209

<div type='discussions-op-text'>

<sup>Originally posted by **sherafatinia** March 15, 2023</sup>
Hi
Uploaded photos are saved with 96 dpi, I didn't find a way to save photos with 72 dpi, how can I do it?</div>