Pasting an image from Safari does not work

When using Firefox or Chrome you can copy an image and paste it into a trix editor and it will become an inline image, when using Safari this does not work.

##### Steps to Reproduce

1. Look up any image
2. Open the context menu and click "Copy Image"
3. Paste into your trix editor4.

You can see these steps performed in both Safari and Firefox in the attached videos.

Safari (where it does not work):

https://user-images.githubusercontent.com/72702/176124974-c2555788-a000-40d7-8115-b4b492db014f.mov

Firefox (where it works):

https://user-images.githubusercontent.com/72702/176126854-a3c2e034-34bc-45cb-8314-9f23d8c51793.mov

##### Details

* Trix version: 1.3.1
* Browser name and version: Safari 15.5 (17613.2.7.1.8)
* Operating system: Mac OS Monterey 12.4

Reproduce the issue in Trix 1.3.1 by copying an image in Safari 15.5 and pasting it into the editor, then compare the same steps in Firefox or Chrome. Trace the editor's paste handling to identify the browser difference; done means a copied Safari image becomes an inline image as it does in the other browsers.

Written by the indexing model from the issue text.