Update custom attributes

{
	"custom_attributes":
  {
	"color":"#F08080",
	"sort_order":"descending"
	}
}

{
      "collection_uuid":"e12553f2-2280-4340-938f-fd813bd3d49d"
      "name":"Room102"
      "type":"GROUP"
      "devices":[
            {
                  "dsn":"TESTDSN_086402_001"
                  "product_name":"TESTDEVICE_001"
                  "oem_model":"ledevb"
                  "lan_enabled":false
                  "connected_at":"2020-07-06T09:32:44Z"
                  "connection_status":"Offline"
            }
            {
                  "dsn":"TESTDSN_255199_000"
                  "product_name":"TESTDEVICE_000"
                  "oem_model":"ledevb-test"
                  "lan_enabled":false
                  "connected_at":"2020-10-29T20:25:37Z"
                  "connection_status":"Offline"
            }
      ]
      "child_collections":[
            {
                  "collection_uuid":"3378223c-b1b8-4ce7-916a-158602901869"
                  "name":"Room103"
            }
      ]
      "custom_attributes":{
            "color":"#F08080"
            "sort_order":"ascending"
      }
}