fix: All main advancements unlocking instantly for 1.19.2

[pandier]

Minecraft version: 1.19.2

Because of an invalid advancement format, all main advancements were unlocked on inventory change.

Diff

"conditions": {
  "items": [
    {
-     "item": "minecraft:example_item"
+     "items": ["minecraft:example_item"]
    }
  ]
}

Explanation

In recent versions, the format has changed. The field has been renamed from item to items and now accepts list of item ids instead of a single item id.