Hi there,

The node example provided (https://github.com/mozilla/pdf.js/tree/master/examples/node) fails on node.js >= 16.7. I believe that's due to the fact that the runtime is checked via `URL.createObjectURL` in `legacy/build/pdf.js` (repo: https://github.com/mozilla/pdfjs-dist/blob/master/legacy/build/pdf.js#L2459) and the fact that it has been recently introduced in node 16.7 (see: https://nodejs.org/api/url.html#urlcreateobjecturlblob)

Configuration:
- Node.js 16.7 or 16.8
- PDF.js version: latest

Steps to reproduce the problem:
1. Run pdf.js node example with node 16.7 or later

Error:
`stack:'ReferenceError: Blob is not defined\n    at createObjectURL`

Thanks!
const name = path.basename(pdfPath, path.extname(pdfPath));
  return path.join(outputDirectory, `${name}-${pageNum}.svg`);
}
/**
 * A readable stream which offers a stream representing the serialization of a
 * given DOM element (as defined by domstubs.js).
 *
 * @param {object} options
 * @param {DOMElement} options.svgElement The element to serialize
 */
function ReadableSVGStream(options) {
  if (!(this instanceof ReadableSVGStream)) {
    return new ReadableSVGStream(options);
  }
  stream.Readable.call(this, options);
  this.serializer = options.svgElement.getSerializer();
}
util.inherits(ReadableSVGStream, stream.Readable);
ReadableSVGStream.prototype._read = function () {
  let chunk;
  while ((chunk = this.serializer.getNext()) !== null) {
    if (!this.push(chunk)) {
      return;
    }
  }
  this.push(null);
};
function writeSvgToFile(svgElement, filePath) {