Ensure the dependencies' versions match the registry

[bucurb]

UnityNuget has a code path that is trying to rewrite package dependencies such that their versions correspond to the ones in registry.json. For instance, consider the case of a package dependency A [1.1.1, ) and a registry entry for that package A [8.0.0]. The code will try to change the dependency to reference A: 8.0.0, as that is what it finds in the registry.json.

However, this version resolution, from 1.1.1 to 8.0.0 is broken. What currently happens is: the code looks-up all available packages A in the feed and stop at the first version that was compatible with the dependency (and not the registry). So if the feed has newer packages, say A 9.0.0, UnityNuget would find that first and rewrite the dependency as A: 9.0.0, regardless of whether 9.0.0 was actually compatible with its own registry.json

Fixes #281

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