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/tools/networking/unbound/python.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, openssl, expat, libevent, swig, pythonPackages }:
+{ lib, stdenv, fetchurl, openssl, expat, libevent, swig, pythonPackages }:
 
 let
   inherit (pythonPackages) python;
@@ -54,7 +54,7 @@ in stdenv.mkDerivation rec {
     patchelf --replace-needed libunbound.so.2 $out/${python.sitePackages}/libunbound.so.2 $out/${python.sitePackages}/_unbound.so
     '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "Python library for Unbound, the validating, recursive, and caching DNS resolver";
     license = licenses.bsd3;
     homepage = "http://www.unbound.net";