buildPythonPackage: use nix-update as the default update script

  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. -->

  # 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;