Error: Call to undefined function Drupal\upload_image_changer\mime_content_type()

I sorry I am not sure how to make a patch, for anyone wanting to fix:
edit this file src/UploadImageChangerHookImplementations.php

change this:
$new_mime = mime_content_type($derived_uri);
to this:
$new_mime = \Drupal::service('file.mime_type.guesser')->guess($derived_uri);