Merge pull request #242461 from Atemu/update/xanmod

let

  # These names are how they are designated in https://xanmod.org.

  ltsVariant = {

    version = "6.1.35";

    hash = "sha256-CfrM2CNaGUTfkVteudL8xnAuCdZJxD5pUEC1YW9LiuU=";

    version = "6.1.37";

    hash = "sha256-g8cmAhsM03jBu7UZoNOLBX7cGg8rz70/xhF7sJj9nCY=";

    variant = "lts";

  };

  mainVariant = {

    version = "6.3.9";

    hash = "sha256-t1fKPZ+giANPmhM4zGoGtYWJF6rDnbpJaoHILl3nyRI=";

    version = "6.4.1";

    hash = "sha256-WPnINDkOj0IoUDLBG/2LOrppVi9o9XSSgMrs/NBbqdA=";

    variant = "main";

  };