buildPythonPackage: use nix-update as the default update script (#435720)

doc/release-notes/rl-2511.section.md

···
   recommendation](https://clickhouse.com/docs/faq/operations/production). Users
   can continue to use the `clickhouse-lts` package if desired.
 
+- `buildPythonPackage` and `buildPythonApplication` now default to `nix-update-script` as their default `updateScript`. This should improve automated updates, since nix-update is better maintained than the in-tree update script and has more robust fetcher support.
+
 ## Nixpkgs Library {#sec-nixpkgs-release-25.11-lib}
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->

pkgs/development/interpreters/python/mk-python-derivation.nix

···
   # Whether the derivation provides a Python module or not.
   toPythonModule,
   namePrefix,
-  update-python-libraries,
+  nix-update-script,
   setuptools,
   pypaBuildHook,
   pypaInstallHook,
···
         inherit disabled;
       }
       // {
-        updateScript =
-          let
-            filename = head (splitString ":" finalAttrs.finalPackage.meta.position);
-          in
-          [
-            update-python-libraries
-            filename
-          ];
+        updateScript = nix-update-script { };
       }
       // optionalAttrs (dependencies != [ ]) {
         inherit dependencies;