fix(rsc): fix dev server websocket error

[jtoar]

Fixes an error in dev when for RSCs. When the dev server starts up, there's a WebSocket server error: Port is already in use:

web | (node:93389) ExperimentalWarning: `--experimental-loader` may be removed in the future; instead use `register()`:
web | --import 'data:text/javascript,import { register } from "node:module"; import { pathToFileURL } from "node:url"; register("%40redwoodjs/vite/react-node-loader", pathToFileURL("./"));'
web | (Use `node --trace-warnings ...` to show where the warning was created)
web | Started server on http://localhost:8910
web | Error: The following dependencies are imported but could not be resolved:
web | 
web |   src/pages/FatalErrorPage (imported by /Users/dom/projects/redwood/redwood-app/web/src/App.tsx)
web |   src/Routes (imported by /Users/dom/projects/redwood/redwood-app/web/src/App.tsx)
web | 
web | Are they installed?
web |     at file:///Users/dom/projects/redwood/redwood-app/node_modules/vite/dist/node/chunks/dep-52909643.js:45779:23
web |     at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
web |     at async file:///Users/dom/projects/redwood/redwood-app/node_modules/vite/dist/node/chunks/dep-52909643.js:45187:38
web | WebSocket server error: Port is already in use

We have two Vite servers running in middleware mode. Seems like one of them needs its own server.