Update a Specific PY Union

{
  "UniCode": "126",
  "UniName": "Chicago Auto Union",
  "UniShortName": "CAU",
  "UniType": null,
  "UniUnionsUniCode": null,
  "UniUnionsUniName": null,
  "UniUseCtlUnionRate": "N",
  "UniCollectBargainRegCode": null,
  "UniCollectBargainRegName": null,
  "UniContactName": null,
  "UniLicenseNo": null,
  "UniLicenseDate": null,
  "UniAddress1": null,
  "UniAddress2": null,
  "UniAddress3": null,
  "UniZipCode": null,
  "UniBankCode": null,
  "UniBranchCode": null,
  "UniBankAccNumber": null,
  "UniCountryCode": null,
  "UniCountryName": null,
  "UniStateCode": null,
  "UniStateName": "Illinois",
  "UniCountyCode": null,
  "UniCountyName": null,
  "UniCityCode": null,
  "UniCityName": null,
  "UniInclAsRegUniAca": "Y",
  "UniShowInclAsRegUniFlag": "N",
  "UniUser": "CMICUSER",
  "UniLastUpdDate": "2023-01-20T12:47:50Z",
  "UniIuCreateDate": "2023-01-20T12:47:50Z",
  "UniIuCreateUser": "CMICUSER",
  "UniIuUpdateDate": null,
  "UniIuUpdateUser": null,
  "UniVUuid": "F2A8505592542DDBE05316821FAC9500",
  "links": [
    {
      "rel": "self",
      "href": "http://mobtest.cmiccloudr12.com:80/cmictestrti/hcm-rest-api/rest/1/pyunions/F2A8505592542DDBE05316821FAC9500",
      "name": "pyunions",
      "kind": "item"
    },
    {
      "rel": "canonical",
      "href": "http://mobtest.cmiccloudr12.com:80/cmictestrti/hcm-rest-api/rest/1/pyunions/F2A8505592542DDBE05316821FAC9500",
      "name": "pyunions",
      "kind": "item"
    }
  ]
}