[CSM-417] Upgrade `default.nix` to use `psc 0.11.5`
[CSM-417] Upgrade `default.nix` to use `psc 0.11.5`

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