Support of JSON Schema draft 8 (2019-09)

### Prerequisites

- [X] I have written a descriptive issue title
- [X] I have searched existing issues to ensure the feature has not already been requested

### 🚀 Feature Proposal

Support of [JSON Schema draft 2019-09](https://json-schema.org/specification-links#draft-2019-09-(formerly-known-as-draft-8)) in addition to JSON Schema draft 7

### Motivation

Allow for JSON schema draft 2020-12 specified in [a different issue](https://github.com/fastify/fast-json-stringify/issues/627)

### Example

_No response_