python3Packages: Fix and document the removal of the local .overrideAttrs attribute (#350127)

pkgs/development/interpreters/python/hooks/default.nix

@@ -122,6 +122,7 @@ in {
       };
       passthru.tests = import ./python-catch-conflicts-hook-tests.nix {
         inherit pythonOnBuildForHost runCommand;
+        inherit lib;
         inherit (pkgs) coreutils gnugrep writeShellScript;
       };
     } ./python-catch-conflicts-hook.sh) {};

pkgs/development/interpreters/python/hooks/python-catch-conflicts-hook-tests.nix

@@ -1,4 +1,4 @@
-{ pythonOnBuildForHost, runCommand, writeShellScript, coreutils, gnugrep }: let
+{ lib, pythonOnBuildForHost, runCommand, writeShellScript, coreutils, gnugrep }: let
 
   pythonPkgs = pythonOnBuildForHost.pkgs;
 
@@ -38,7 +38,7 @@
   );
 
   # in order to test for a failing build, wrap it in a shell script
-  expectFailure = build: errorMsg: build.overrideDerivation (old: {
+  expectFailure = build: errorMsg: lib.overrideDerivation build (old: {
     builder = writeShellScript "test-for-failure" ''
       export PATH=${coreutils}/bin:${gnugrep}/bin:$PATH
       ${old.builder} "$@" > ./log 2>&1