Unpins a comment

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  "data": {
    "id": "456",
    "type": "comments",
    "attributes": {
      "note": "Looks good! I added a few edge cases to handle. Let me know if you need help with the OAuth token refresh flow.",
      "created_at": "2026-03-10T11:30:00.000+00:00",
      "updated_at": "2026-03-10T11:30:00.000+00:00",
      "commentable_type": "task",
      "commentable_id": 120501
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