curl --request GET \
  --url https://api.hubapi.com/content/api/v2/layouts/{layoutId}/versions

[
  {
    "id": 123,
    "object": {
      "id": "<string>",
      "label": "<string>",
      "path": "<string>",
      "category_id": "<string>",
      "created": 123,
      "updated": 123,
      "deleted_at": 123,
      "body_class": "<string>",
      "body_css_id": "<string>",
      "layout_data": {},
      "custom_head": "<string>",
      "include_default_custom_css": true,
      "enable_domain_stylesheet": true,
      "attached_stylesheets": [
        "<string>"
      ]
    },
    "updated_at": 123,
    "user": {
      "email": "<string>",
      "full_name": "<string>",
      "id": 123,
      "username": "<string>"
    }
  }
]