tools: update nixpkgs-unstable to d1c15b7d5806069da59e819999d70e1cec0

PR-URL: https://github.com/nodejs/node/pull/61931
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

tools/nix/pkgs.nix

@@ -1,10 +1,10 @@
 arg:
 let
   repo = "https://github.com/NixOS/nixpkgs";
-  rev = "2343bbb58f99267223bc2aac4fc9ea301a155a16";
+  rev = "d1c15b7d5806069da59e819999d70e1cec0760bf";
   nixpkgs = import (builtins.fetchTarball {
     url = "${repo}/archive/${rev}.tar.gz";
-    sha256 = "03qwpi78578vlp1y1wfg5yrfyinp82sq16z910gijpphc16dd2rf";
+    sha256 = "08f0iv9rn4d9ha35kblqpkrgbbnfby87bj8fx1839l3r4grqdnvg";
   }) arg;
 in
 nixpkgs