Switch server.hot to server.ws for vite

[fahhem]

Honestly, I don't know what I'm doing here. However, the ViteDevServer (https://vite.dev/guide/api-javascript.html#vitedevserver) doesn't seem to have a hot attribute, only ws. and this change fixes the error I was seeing (specifically, Cannot read properties of undefined (reading 'send')), so 🤷‍♂️ here's a PR!

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[markdalgleish]

I haven't see this error myself — are you able to share a repro?

[timdorr]

Note that these are both supported, but it should probably be left as-is:

https://github.com/vitejs/vite/blob/c0e68da4774f3487e9ba0c4d4d2c5e76bdc890ea/packages/vite/src/node/server/index.ts#L272-L282

ws is just the generic WebSocket for communication with the browser. hot uses that, but also allows pluggability into the HMR messages so that other systems/plugins can subscribe as well. Practically, they may be equivalent, but it sounds like hot is the better option.