[CBR-82] Use hackage version for servant-quickcheck rather than github fork
[CBR-82] Use hackage version for servant-quickcheck rather than github fork

We use to point to a custom fork while Matt was pushing the changes upstream. By the time the branch was merged, we finally got to publish the fix to hackage. Cleaner to have it pulled from there.

input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl