niv: build using up to date dependencies

Upstream finally cut a new release with some adjustments allowing niv to
be built using the Stackage LTS solver.

pkgs/development/haskell-modules/configuration-common.nix

@@ -1045,12 +1045,6 @@ self: super: {
   # Generate shell completion.
   cabal2nix = generateOptparseApplicativeCompletion "cabal2nix" super.cabal2nix;
 
-  # 2022-03-20: niv is unmaintained we pin stuff to keep it running
-  niv = generateOptparseApplicativeCompletion "niv" (super.niv.overrideScope (self: super: {
-   optparse-applicative = self.optparse-applicative_0_15_1_0;
-   aeson = self.aeson_1_5_6_0;
-  }));
-
   ormolu = generateOptparseApplicativeCompletion "ormolu" super.ormolu;
 
   stack =

pkgs/development/haskell-modules/configuration-nix.nix

@@ -95,7 +95,7 @@ self: super: builtins.intersectAttrs super {
   sfml-audio = appendConfigureFlag "--extra-include-dirs=${pkgs.openal}/include/AL" super.sfml-audio;
 
   # avoid compiling twice by providing executable as a separate output (with small closure size)
-  niv = enableSeparateBinOutput super.niv;
+  niv = enableSeparateBinOutput (generateOptparseApplicativeCompletion "niv" super.niv);
   ormolu = enableSeparateBinOutput super.ormolu;
   ghcid = enableSeparateBinOutput super.ghcid;