HEIF images lose saturation

**Description of the bug**

While loading .heif images works, the texture2D loaded loses a bunch of saturation.

**Reproduction steps**

To replicate this issue just load an image taken on an iPhone (IOS 11+) camera a load it to unity.

**Platform specs**

- Unity version: 2020.3.17f1
- Platform: Android, iOS
- Device: iPhone - IOS 11+
- How did you download the plugin: GitHub

