Missing dark background for select options

[taidaid]

The theme shipped without good dark-mode support for select options:

My fix was to add it to the select__option key, however, ideally it would come built-in.

  select__option: {
    "group-data-[disabled]:opacity-50": true,
    "group-data-[disabled]:select-none": true,
    "group-data-[multiple]:checked:bg-indigo-100": true,
    "group-data-[multiple]:focus:bg-indigo-100": true,
    "group-data-[multiple]:text-sm": true,
    "group-data-[multiple]:outline-none": true,
    "group-data-[multiple]:border-none": true,
    "group-data-[multiple]:py-1.5": true,
    "group-data-[multiple]:px-1.5": true,
    "dark:group-data-[multiple]:focus:bg-indigo-700": true,
    "dark:group-data-[multiple]:checked:bg-indigo-700": true,
    "dark:bg-gray-900": true // added
  },