make submodule updates default to `false`
it was useful for the ci builds but since we don't want blessed builds to reach out to the net having it as false (with still the option to enable it for e.g. phoc) is the better choice.
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it was useful for the ci builds but since we don't want blessed builds to reach out to the net having it as false (with still the option to enable it for e.g. phoc) is the better choice.