Fix Mima.get(), and minor optimization in origin(), once a new Mima version is released

[vorburger]

This is to remind myself that when a new Mima version is released which includes maveniverse/mima#167 (and maveniverse/mima#169) for maveniverse/mima#166, then I will:

1. Fix this for Mima.get()

2. Can replace this with this, because of this, which is new:

public static Optional<URI> origin(ModelResponse modelResponse) {
        var repository = modelResponse.getRepository();
        if (repository instanceof RemoteRepository remoteRepository) {
            return Optional.of(URI.create(remoteRepository.getUrl()));
        }
        return Optional.empty();
    }

@cstamas Thank You!

[cstamas]

https://github.com/maveniverse/mima/releases/tag/release-2.4.22

Central sync pending (less than 1h usually)