multiple flakes on /api/v2/users/first

```
        	Error:      	Received unexpected error:
        	            	Post "http://localhost:44613/api/v2/users/first": net/http: HTTP/1.x transport connection broken: malformed HTTP status code "/api/v2/users/first"
```

e.g. https://github.com/coder/coder/actions/runs/7551232849/job/20558166512
and https://github.com/coder/coder/actions/runs/7551233273/job/20558169937 and others