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


let reason = process.env.PDFJS_UPDATE_REASON;
    
    if (typeof reason === "string") {
      const reasonParts =
        /^(See )(mozilla\/pdf\.js)@tags\/(v\d+\.\d+\.\d+)\s*$/.exec(reason);
      if (reasonParts) {
        reason =
          reasonParts[1] +
          "https://github.com/" +
          reasonParts[2] +
          "/releases/tag/" +
          reasonParts[3];
      }
    }
    const message =
      "PDF.js version " + VERSION + (reason ? " - " + reason : "");
    safeSpawnSync("git", ["add", "*"], { cwd: DIST_DIR });
    safeSpawnSync("git", ["commit", "-am", message], { cwd: DIST_DIR });
    safeSpawnSync("git", ["tag", "-a", "v" + VERSION, "-m", message], {
      cwd: DIST_DIR,
    });
    console.log();
    console.log("Done. Push with");
    console.log(
      "  cd " + DIST_DIR + "; git push --tags " + DIST_REPO_URL + " master"
    );
    console.log();
    done();
  })
);