nix-heuristic-gc: Pin nix_2_24

pkgs/by-name/ni/nix-heuristic-gc/package.nix

@@ -3,7 +3,7 @@
 {
   lib,
   fetchFromGitHub,
-  nix,
+  nixVersions,
   boost,
   python3Packages,
 }:
@@ -19,12 +19,12 @@ python3Packages.buildPythonPackage rec {
 
   # NIX_SYSTEM suggested at
   # https://github.com/NixOS/nixpkgs/issues/386184#issuecomment-2692433531
-  NIX_SYSTEM = nix.stdenv.hostPlatform.system;
-  NIX_CFLAGS_COMPILE = [ "-I${lib.getDev nix}/include/nix" ];
+  NIX_SYSTEM = nixVersions.nix_2_24.stdenv.hostPlatform.system;
+  NIX_CFLAGS_COMPILE = [ "-I${lib.getDev nixVersions.nix_2_24}/include/nix" ];
 
   buildInputs = [
     boost
-    nix
+    nixVersions.nix_2_24
     python3Packages.pybind11
     python3Packages.setuptools
   ];