React 17 compatibility

I'm working on a PR that implements this component, and it works well. However, React 17 isn't allowed with the current peerDependency settings: https://github.com/GraphCMS/react-image/blob/main/package.json#L41-L42

It would be nice if React 17 were allowed as well. From my testing it seems to be compatible.

[fweth]

Ract 18 would be nice as well :)

[kylekarpack]

I forked this and released @karpack/react-image here: https://www.npmjs.com/package/@karpack/react-image. It's compatible with React 17 and 18, at least superficially