Bump nixpkgs pins and add 24.05

Author: hamishmack

ci.nix

@@ -22,6 +22,7 @@
     "R2211" = inputs.nixpkgs-2211;
     "R2305" = inputs.nixpkgs-2305;
     "R2311" = inputs.nixpkgs-2311;
+    "R2405" = inputs.nixpkgs-2405;
     "unstable" = inputs.nixpkgs-unstable;
   };
 
@@ -56,7 +57,7 @@
       # cabal-install and nix-tools plans.  When removing a ghc version
       # from here (so that is no longer cached) also remove ./materialized/ghcXXX.
       # Update supported-ghc-versions.md to reflect any changes made here.
-      nixpkgs.lib.optionalAttrs (nixpkgsName == "R2311") {
+      nixpkgs.lib.optionalAttrs (nixpkgsName == "R2405") {
         ghc94 = false;
         ghc96 = false;
         ghc98 = false;

flake.lock

@@ -10,6 +10,7 @@
     nixpkgs-2211 = { url = "github:NixOS/nixpkgs/nixpkgs-22.11-darwin"; };
     nixpkgs-2305 = { url = "github:NixOS/nixpkgs/nixpkgs-23.05-darwin"; };
     nixpkgs-2311 = { url = "github:NixOS/nixpkgs/nixpkgs-23.11-darwin"; };
+    nixpkgs-2405 = { url = "github:NixOS/nixpkgs/nixpkgs-24.05-darwin"; };
     nixpkgs-unstable = { url = "github:NixOS/nixpkgs/nixpkgs-unstable"; };
     flake-compat = { url = "github:input-output-hk/flake-compat/hkm/gitlab-fix"; flake = false; };
     "hls-1.10" = { url = "github:haskell/haskell-language-server/1.10.0.0"; flake = false; };
@@ -82,13 +83,14 @@
     , nixpkgs-2211
     , nixpkgs-2305
     , nixpkgs-2311
+    , nixpkgs-2405
     , flake-compat
     , ...
     }@inputs:
     let
       callFlake = import flake-compat;
 
-      ifdLevel = 1;
+      ifdLevel = 0;
       compiler = "ghc928";
       config = import ./config.nix;