incorrect package.json definition for use of `ajv8`

We are seeing an [issue](https://github.com/rjsf-team/react-jsonschema-form/issues/3413) in @rjsf where the user is getting duplicate `ajv` instances in their webpack distribution. I'm fairly certain it is because `ajv-formats` has an incorrect `dependencies` for `ajv8` since it is also a `peerDependency` AND `devDependency`. It seems like the `dependency` itself is causing this issue. Moreover, it probably make sense to not have ajv8 as an optional peerDependency once you remove it as a dependency