Update default compiler to GHC 9.6.6 (from 9.2.8)

Author: hamishmack

flake.nix

@@ -85,7 +85,7 @@
 
       ifdLevel = 3;
       runningHydraEvalTest = false;
-      defaultCompiler = "ghc928";
+      defaultCompiler = "ghc966";
       config = import ./config.nix;
 
       inherit (nixpkgs) lib;

hix/init/nix/hix.nix

@@ -1,6 +1,6 @@
 {pkgs, ...}: {
   # name = "project-name";
-  compiler-nix-name = "ghc92"; # Version of GHC to use
+  compiler-nix-name = "ghc96"; # Version of GHC to use
 
   # Cross compilation support:
   # crossPlatforms = p: pkgs.lib.optionals pkgs.stdenv.hostPlatform.isx86_64 ([