treewide: with stdenv.lib; in meta -> with lib;

Part of: https://github.com/NixOS/nixpkgs/issues/108938

meta = with stdenv.lib;

is a widely used pattern. We want to slowly remove
the `stdenv.lib` indirection and encourage people
to use `lib` directly. Thus let’s start with the meta
field.

This used a rewriting script to mostly automatically
replace all occurances of this pattern, and add the
`lib` argument to the package header if it doesn’t
exist yet.

The script in its current form is available at
https://cs.tvl.fyi/depot@2f807d7f141068d2d60676a89213eaa5353ca6e0/-/blob/users/Profpatsch/nixpkgs-rewriter/default.nix

pkgs/development/tools/async/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, rustPlatform }:
+{ lib, stdenv, fetchFromGitHub, rustPlatform }:
 
 rustPlatform.buildRustPackage rec {
   pname = "async";
@@ -13,7 +13,7 @@ rustPlatform.buildRustPackage rec {
 
   cargoSha256 = "1zgds5rjjikvaj0rxc7slyvkjn067s0v8vdnxn3vsv819q5yd707";
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "A tool to parallelize shell commands";
     longDescription = ''
       `async` is a tool to run shell commands in parallel and is designed to be