Replace nixFlakes -> nixUnstable

pkgs/tools/misc/nix-direnv/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, gnugrep, nixFlakes }:
+{ lib, stdenv, fetchFromGitHub, gnugrep, nixUnstable }:
 
 stdenv.mkDerivation rec {
   pname = "nix-direnv";
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   # Substitute instead of wrapping because the resulting file is
   # getting sourced, not executed:
   postPatch = ''
-    sed -i "1a NIX_BIN_PREFIX=${nixFlakes}/bin/" direnvrc
+    sed -i "1a NIX_BIN_PREFIX=${nixUnstable}/bin/" direnvrc
     substituteInPlace direnvrc --replace "grep" "${gnugrep}/bin/grep"
   '';
 

pkgs/tools/package-management/nix-update/default.nix

@@ -1,7 +1,7 @@
 { lib
 , buildPythonApplication
 , fetchFromGitHub
-, nixFlakes
+, nixUnstable
 , nix-prefetch
 , nixpkgs-fmt
 , nixpkgs-review
@@ -19,7 +19,7 @@ buildPythonApplication rec {
   };
 
   makeWrapperArgs = [
-    "--prefix" "PATH" ":" (lib.makeBinPath [ nixFlakes nix-prefetch nixpkgs-fmt nixpkgs-review ])
+    "--prefix" "PATH" ":" (lib.makeBinPath [ nixUnstable nix-prefetch nixpkgs-fmt nixpkgs-review ])
   ];
 
   checkPhase = ''

pkgs/tools/package-management/nixpkgs-review/default.nix

@@ -1,7 +1,7 @@
 { lib
 , python3
 , fetchFromGitHub
-, nixFlakes
+, nixUnstable
 , git
 }:
 
@@ -17,7 +17,7 @@ python3.pkgs.buildPythonApplication rec {
   };
 
   makeWrapperArgs = [
-    "--prefix" "PATH" ":" (lib.makeBinPath [ nixFlakes git ])
+    "--prefix" "PATH" ":" (lib.makeBinPath [ nixUnstable git ])
   ];
 
   doCheck = false;