Update VRS and VERSATILE validation

[ielis]

Ensure correctness of the validation parts that use VRS and VERSATILE JSON schemas.

[pnrobinson]

Is it better just to update to the same JSON Schema version?

[ielis]

@pnrobinson I think we should stick to a specific vrs.json version, regardless of the $schema. The JSON schema library we use under the hood can handle multiple specification versions/$schemas.

With respect to vrsatile.json, I just proofread the specification and it is in line with the read the docs.