fix: Specifies type of package as module

[DKFN]

In the process of changing framework from Gatsby to Astro, I have stumbled on a build error while using React SSR with astro using this package.

22:57:28 [ERROR] Cannot use import statement outside a module
  Stack trace:
    at internalCompileFunction (node:internal/vm:73:18)
    at Module._compile (node:internal/modules/cjs/loader:1220:27)
    at Module.load (node:internal/modules/cjs/loader:1119:32)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:169:29)

• [ ] Chore (a non-breaking change which is related to package maintenance)
• [x] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

This change involves specifying the type of the package to module, wich seems to be the intended type.

Linking this package locally and setting a component using the prismicio to render with SSR works great, for example:

import {PrismicImage} from "@prismicio/react";

const serializer = {
    image: ({node}) => renderToString(<PrismicImage field={node} />)
}

It also keep working for clientside only rendered components.

Resolves: #193

Checklist:

• [ ] My change requires an update to the official documentation.
• [x] All TSDoc comments are up-to-date and new ones have been added where necessary.
• [x] All new and existing tests are passing.

Thanks for your time :)

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