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(
  "mozcentralbaseline",
  gulp.series(createBaseline, function createMozcentralBaseline(done) {
    console.log();
    console.log("### Creating mozcentral baseline environment");
    
    rimraf.sync(BASELINE_DIR + BUILD_DIR);
    const workingDirectory = path.resolve(process.cwd(), BASELINE_DIR);
    safeSpawnSync("gulp", ["mozcentral"], {
      env: process.env,
      cwd: workingDirectory,
      stdio: "inherit",
    });
    
    rimraf.sync(MOZCENTRAL_BASELINE_DIR);
    mkdirp.sync(MOZCENTRAL_BASELINE_DIR);
    gulp
      .src([BASELINE_DIR + BUILD_DIR + "mozcentral/**/*"])
      .pipe(gulp.dest(MOZCENTRAL_BASELINE_DIR))
      .on("end", function () {
        
        safeSpawnSync("git", ["init"], { cwd: MOZCENTRAL_BASELINE_DIR });
        safeSpawnSync("git", ["add", "."], { cwd: MOZCENTRAL_BASELINE_DIR });
        safeSpawnSync("git", ["commit", "-m", '"mozcentral baseline"'], {
          cwd: MOZCENTRAL_BASELINE_DIR,
        });
        done();
      });
  })
);