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Now that https://github.com/zcash/pasta_curves is licensed under MIT/Apache, we can depend on it directly here. This simplifies trait definitions (which previously had to be wrapped, with duplicate implementations of standard operations, when providing) for pasta curves.
I removed the dev dependency on Ristretto under the assumption that it was only a placeholder whose purpose could be served by Pasta now. This allowed upgrading the rand dependency, which is useful downstream.