Update dataset

## Authentication - API key: `Authorization: Bearer ` Request body example: ```json { "name": "Support Conversations - July (v2)", "description": "Renamed" } ``` Response (200 OK): ```json { "id": "6d0b2c7e-3a6a-4c09-9c7e-1f2d9e2d3f0a", "name": "Support Conversations - July (v2)", "type": "sampling", "description": "Renamed", "created_at": "2025-07-26T00:00:00Z", "updated_at": "2025-07-27T08:10:00Z", "organization": 123, "initial_log_filters": { "status_code": { "operator": "eq", "value": 200 } }, "unique_organization_ids": [], "timestamps": [], "log_count": 250, "evaluator": null, "status": "ready", "running_status": "pending", "running_progress": 0, "running_at": null, "completed_annotation_count": 0 } ``` Errors: - 400 Bad Request — Invalid payload - 401 Unauthorized — Missing/invalid authentication - 404 Not Found — Dataset not found or not in your organization