Allow changing object property specifier (?) when updating it

[Jason Kuhrt]

The feature request is to make this possible:

$<Objects.update<'path', 1>, {path?:2}> // $ExpectType {path: 1}

That would be a breaking change, and doesn't support going the other direction. So probably a new function like this:

$<Objects.update<'path', 1>, Objects.updateSpecifier<'-?', 'path'>, {path?:2}> // $ExpectType {path: 1}