gitkraken: remove scoped lib usage

  src = srcs.${stdenv.hostPlatform.system} or throwSystem;

  meta = with lib; {

  meta = {

    homepage = "https://www.gitkraken.com/git-client";

    description = "Simplifying Git for any OS";

    sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];

    license = licenses.unfree;

    license = lib.licenses.unfree;

    platforms = builtins.attrNames srcs;

    maintainers = with maintainers; [

    maintainers = with lib.maintainers; [

      nicolas-goudry

      Rishik-Y

    ];