Google encourages site authors to present structured data to give
explicit clues about the meaning of content on the page. This change
adds the script type, `application/ld+json`, to the allowed script tag
types.

Page from Google's search docs:
https://developers.google.com/search/docs/guides/intro-structured-data

Example from the docs:

```
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Organization",
  "url": "http://www.example.com",
  "name": "Unlimited Ball Bearings Corp.",
  "contactPoint": {
    "@type": "ContactPoint",
    "telephone": "+1-401-555-1212",
    "contactType": "Customer service"
  }
}
</script>
```