Bug: If a capture group is part of an optional parent group it is not marked as optional

[Nokel81]

Current:

const regex = TypedRegEx("^\w+(@(?<version>[a-z0-9-_.]+))?$", "gi");
const captures = regex.captures(...); // { version: string } | undefined;

Expected:

const regex = TypedRegEx("^\w+(@(?<version>[a-z0-9-_.]+))?$", "gi");
const captures = regex.captures(...); // { version?: string | undefined } | undefined;