`buildPythonPackage`: buildtime dependency on an extra requires

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this build.nix provided by a saint was the fix where overrideAttrs is used to override the optional-dependencies and then using it as well as just skipping the build time dep check with pypaBuildFlags:

# this nix expression fetches the heckman feature branch but pulled onto the 0.14.1 release

{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/refs/tags/23.11.tar.gz") { }
}:
pkgs.python3Packages.buildPythonPackage {
  pname = "statsmodels";
  version = "0.14.1";

  src = pkgs.fetchgit {
    url = "https://codeberg.org/lotta/heckman.rebase.statsmodels.0_14_1";
    # ref = "main";
    rev = "f6a51a72558a51f5cb4dcbd8821c71b37a12941f";
    deepClone = true;
    sha256 = "sha256-pShKeZ3eQg1QKP3QlRZdjs4ITfZ2/JBqrlj43efrsMs=";
  };

  nativeBuildInputs = [ pkgs.python3Packages.pip pkgs.git ];

  propagatedBuildInputs = with pkgs.python3Packages; [
    setuptools
    packaging
    cython
    numpy
    scipy
    setuptools-scm
    (setuptools-scm.overrideAttrs (final: super: { passthru.optional-dependencies.toml = [tomli]; })).optional-dependencies.toml
    oldest-supported-numpy
  ];

  pypaBuildFlags = ["--skip-dependency-check"];

  pyproject = true;

  meta = with pkgs.lib; {
    description = "rebase of the outstanding pr adding a heckman model on top of the 0.14.1 release of statsmodels.";
    license = licenses.bsd3;
  };
}