chore: Rename pkgs->depot in all Nix file headers

nix/buildLisp/default.nix

@@ -4,12 +4,11 @@
 # buildLisp is designed to enforce conventions and do away with the
 # free-for-all of existing Lisp build systems.
 
-{ pkgs ? { third_party = import <nixpkgs> {}; }
-, ... }:
+{ pkgs ? import <nixpkgs> {}, ... }:
 
 let
   inherit (builtins) map elemAt match filter;
-  inherit (pkgs.third_party) lib runCommandNoCC makeWrapper writeText writeShellScriptBin sbcl;
+  inherit (pkgs) lib runCommandNoCC makeWrapper writeText writeShellScriptBin sbcl;
 
   #
   # Internal helper definitions

nix/buildLisp/example/default.nix

@@ -1,7 +1,7 @@
-{ pkgs, ... }:
+{ depot, ... }:
 
 let
-  inherit (pkgs.nix) buildLisp;
+  inherit (depot.nix) buildLisp;
 
   # Example Lisp library.
   #

nix/tailscale/default.nix

@@ -2,9 +2,9 @@
 #
 # https://tailscale.com/kb/1018/install-acls
 
-{ pkgs, ... }:
+{ depot, ... }:
 
-with pkgs.nix.yants;
+with depot.nix.yants;
 
 let
   inherit (builtins) toFile toJSON;

nix/yants/tests/default.nix

@@ -1,7 +1,7 @@
-{ pkgs, ... }:
+{ depot, pkgs, ... }:
 
 with builtins;
-with pkgs.nix.yants;
+with depot.nix.yants;
 
 # Note: Derivations are not included in the tests below as they cause
 # issues with deepSeq.