[Request] Add tag for spirit items

[Noaaan]

We are planning on adding better mod compatability for Spectrum, as a part of DaFuqs/Spectrum#520
One thing we noticed is the lack of a tag for the spirit items. Ideally, this would be added to Malum itself, to cause less confusion.
This is what we added to malum/tags/items/spirit_crystals.json:

{
  "values": [
    "malum:sacred_spirit",
    "malum:wicked_spirit",
    "malum:arcane_spirit",
    "malum:eldritch_spirit",
    "malum:aerial_spirit",
    "malum:aqueous_spirit",
    "malum:earthen_spirit",
    "malum:infernal_spirit"
  ]
}

[SammySemicolon]

Done in 1.6.4