Update pdfjs to v4 with code for importing commonjs

[plocket]

This is low priority because the current pdfjs vulnerabilities don't really apply to our situation. pdfjs v4 requires us to use import while the rest of the framework uses require. Here's one person's solution if I understand correctly.

async function importEsmModule<T>(name: string): Promise<T> {
  // FIXME: see https://stackoverflow.com/questions/65265420/how-to-prevent-typescript-from-transpiling-dynamic-imports-into-require
  // eslint-disable-next-line no-eval
  const module = eval(`(async () => {return await import("${name}")})()`);
  return module as T;
}

async function getPdf(params) {
  const { getDocument } = await importEsmModule<any>('pdfjs-dist/legacy/build/pdf.mjs');
  return getDocument(params)
}

I completely forgot how I came up with it, it's ugly as hell, but it works. And I only call the lib once so it's enough.