Adapt to more recent haskell.nix (#107)

Author: angerman

src/core/mkShellWith.nix

@@ -34,7 +34,7 @@ let
   };
 
   ghc = if shell.tools.haskellCompilerVersion == null then
-    "ghc8107"
+    "ghc96"
   else
     shell.tools.haskellCompilerVersion;
 

src/ext/cabal-fmt.nix

@@ -7,7 +7,7 @@ let
 
     version = "0.1.12";
 
-    compiler-nix-name = "ghc92";
+    compiler-nix-name = "ghc96";
 
     # Cabal is a lib library, so haskell.nix would normally use the one coming
     # from the compiler-nix-name (currently 3.2). However cabal-fmt depends on

src/ext/fourmolu.nix

@@ -7,7 +7,7 @@ let
   project = pkgs.haskell-nix.hackage-project {
     name = "fourmolu";
     version = "0.16.2.0";
-    compiler-nix-name = "ghc982";
+    compiler-nix-name = "ghc98";
 
     modules =
       [{ packages.fourmolu.components.exes.fourmolu.dontStrip = false; }];