Update repository.url to match npm expectation (#1426)

## Description

This should fix [an error publishing to
npm](https://github.com/workos/workos-node/actions/runs/20600211504/job/59164131172)

## Documentation

Does this require changes to the WorkOS Docs? E.g. the [API
Reference](https://workos.com/docs/reference) or code snippets need
updates.

```
[ ] Yes
```

If yes, link a related docs PR and add a docs maintainer as a reviewer.
Their approval is required.