Update terriajs-cesium Resource.js

[himby]

I was adding and removing catalog items. Then I noticed that the memory builds up and never get released after removal.

I then found this: Cesium commit

Which deals with the cancelFunction of the request in Resource.js

function loadWithXhr(options) {
  // Take advantage that most parameters are the same
  var resource = new Resource(options);

  var request = resource._makeRequest({
    responseType: options.responseType,
    overrideMimeType: options.overrideMimeType,
    method: defaultValue(options.method, "GET"),
    data: options.data
  });

  request.cancelFunction = undefined;

  return makeRealPromise(request);
}

I tried adding request.cancelFunction = undefined; manually in loadWithXhr.js and noticed that the memory is released properly. I know this is not a good solution, but it kind of confirmed my suspicion.
Is there by any chance possible to update terriajs-cesium with this included in Resource.js like in the Cesium commit?

Could be related to:
#4816