fix(tests): remove @node/types (#386)

stampy.ts tests were failing (e.g. https://github.com/StampyAI/stampy-ui/actions/runs/7854687158/job/21435971107) with the following error:

```
    app/server-utils/stampy.ts:196:45 - error TS2576: Property 'json' does not exist on type 'Response'. Did you mean to access the static member 'Response.json' instead?

    196     json = await (await fetch(url, params)).json()
```

Removed @nodes/types as I think it was due to the types conflict described cloudflare/workerd#1298.

package.json

@@ -26,7 +26,6 @@
     "@types/lodash": "^4.14.202",
     "@types/markdown-it": "^13.0.7",
     "@types/markdown-it-footnote": "^3.0.3",
-    "@types/node": "^20.11.16",
     "@types/react": "^18.2.53",
     "@types/react-dom": "^18.2.18",
     "@typescript-eslint/eslint-plugin": "^6.20.0",