Retrieves an incident action item

curl --request GET \
  --url https://api.rootly.com/v1/action_items/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "45bc763e-2e78-4e87-bc05-304ac55d53e6",
    "type": "incident_action_items",
    "attributes": {
      "incident_id": "c0ec0366-b917-44b7-8d44-1305fab22204",
      "incident_title": "Sint libero eos magni.",
      "description": "shabby chic wolf locavore pickled twee poke. YOLO godard health goth pork belly cold-pressed swag",
      "assigned_to": null,
      "assigned_to_group_ids": [],
      "kind": "follow_up",
      "priority": "medium",
      "status": "open",
      "due_date": null,
      "jira_issue_id": null,
      "jira_issue_key": null,
      "jira_issue_url": null,
      "asana_task_id": null,
      "asana_task_url": null,
      "github_issue_id": null,
      "github_issue_url": null,
      "gitlab_issue_id": null,
      "gitlab_issue_url": null,
      "shortcut_story_id": null,
      "shortcut_story_url": null,
      "shortcut_task_id": null,
      "shortcut_task_url": null,
      "trello_card_id": null,
      "trello_card_url": null,
      "linear_issue_id": null,
      "linear_issue_url": null,
      "zendesk_ticket_id": null,
      "zendesk_ticket_url": null,
      "motion_task_id": null,
      "motion_task_url": null,
      "clickup_task_id": null,
      "clickup_task_url": null,
      "airtable_base_key": null,
      "airtable_table_name": null,
      "airtable_record_id": null,
      "airtable_record_url": null,
      "freshservice_ticket_id": null,
      "freshservice_ticket_url": null,
      "freshservice_task_id": null,
      "freshservice_task_url": null,
      "url": "https://test.rootly.com/account/incidents/sint-libero-eos-magni#nav-action-items",
      "short_url": null,
      "created_at": "2025-08-26T21:26:03.552-07:00",
      "updated_at": "2025-08-26T21:26:03.552-07:00",
      "summary": "shabby chic wolf locavore pickled twee poke. YOLO godard health goth pork belly cold-pressed swag"
    }
  }
}