In Webpack 5, the [recommended way](https://webpack.js.org/guides/web-workers/) to create a web worker is

```ts
new Worker(new URL('./worker.js', import.meta.url));
```

Could we update\* the [`pdfjs-dist/webpack` entrypoint](https://github.com/mozilla/pdfjs-dist/blob/master/webpack.js) to use this syntax instead of the legacy `worker-loader`? One of the Webpack contributors told me that `worker-loader` uses "magic" and can cause issues.

\* To maintain compatibility with people still using Webpack 4, we should probably introduce a new entrypoint called `pdfjs-dist/webpack5` (or something like that) rather than changing the existing entrypoint.

Can attempt a PR if you would like.

Closely-related: https://github.com/mozilla/pdf.js/issues/15302


gulp.task(
  "lint-chromium",
  gulp.series(
    function scriptingLintChromium() {
      const defines = builder.merge(DEFINES, {
        CHROME: true,
        SKIP_BABEL: false,
        TESTING: false,
      });
      return buildDefaultPreferences(defines, "lint-chromium/");
    },
    function runLintChromium(done) {
      console.log();
      console.log("### Checking supplemental Chromium files");
      if (
        !checkChromePreferencesFile(
          "extensions/chromium/preferences_schema.json",
          getDefaultPreferences("lint-chromium/")
        )
      ) {
        done(new Error("chromium/preferences_schema is not in sync."));
        return;
      }
      done();
    }
  )
);
gulp.task("dev-css", function createDevCSS() {
  console.log();
  console.log("### Building development CSS");