Reschedule broadcast

curl --request PATCH \
  --url https://api.zavu.dev/v1/broadcasts/{broadcastId}/schedule \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "scheduledAt": "2024-01-15T14:00:00Z"
}
'

{
  "broadcast": {
    "id": "brd_abc123",
    "name": "<string>",
    "totalContacts": 123,
    "createdAt": "2023-11-07T05:31:56Z",
    "text": "<string>",
    "content": {
      "mediaUrl": "<string>",
      "mediaId": "<string>",
      "mimeType": "<string>",
      "filename": "<string>",
      "templateId": "<string>",
      "templateVariables": {},
      "templateButtonVariables": {},
      "templateHeaderVariables": {}
    },
    "senderId": "<string>",
    "emailSubject": "<string>",
    "pendingCount": 123,
    "sendingCount": 123,
    "deliveredCount": 123,
    "failedCount": 123,
    "estimatedCost": 123,
    "reservedAmount": 123,
    "actualCost": 123,
    "scheduledAt": "2023-11-07T05:31:56Z",
    "startedAt": "2023-11-07T05:31:56Z",
    "completedAt": "2023-11-07T05:31:56Z",
    "metadata": {},
    "updatedAt": "2023-11-07T05:31:56Z",
    "reviewResult": {
      "score": 123,
      "categories": [
        "<string>"
      ],
      "reasoning": "<string>",
      "reviewedAt": "2023-11-07T05:31:56Z",
      "flaggedContent": [
        "<string>"
      ]
    },
    "reviewAttempts": 123
  }
}