import requests

url = "https://platform.ankra.app/api/v1/clusters/upcloud/{cluster_id}/upgrade-k8s-version"

payload = { "target_version": "<string>" }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "previous_version": "<string>",
  "new_version": "<string>",
  "nodes_affected": 123
}