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/python-modules/pytest-raisesregexp/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, fetchPypi
+{ lib, stdenv, buildPythonPackage, fetchPypi
 , py, pytest }:
 
 buildPythonPackage rec {
@@ -18,7 +18,7 @@ buildPythonPackage rec {
     substituteInPlace setup.py --replace "long_description=open('README.rst').read()," "long_description=io.open('README.rst', encoding='utf-8').read(),"
   '';
 
-  meta = with stdenv.lib; {
+  meta = with lib; {
     description = "Simple pytest plugin to look for regex in Exceptions";
     homepage = "https://github.com/Walkman/pytest_raisesregexp";
     license = with licenses; [ mit ];