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Ultimately as a user / customer I dont care who maintains the bindings I need to use to achieve my goal.

1. These wrappers are Open Source.

2. I do not have customers that requested either one of these wrappers.

3. Customers that do use one of wrappers, as AdGuard for example, maintain their own version of Sciter/Go: https://github.com/AdguardTeam/go-sciter

What kind of license do I need to buy for the bindings to be updated?

As with any other Open Source project - contact its author and discuss with him/her.

Might end up being yourself.