Failing Express.js ESM Support

Using this import:

`import { serve } from "@upstash/workflow/express";`

I get this error in an Express.js ESM app:

```
file:///XXX/node_modules/.pnpm/@upstash+workflow@0.2.1/node_modules/@upstash/workflow/chunk-ADOBNR4O.mjs:11
  throw Error('Dynamic require of "' + x + '" is not supported');
        ^

Error: Dynamic require of "path" is not supported
```