ssr-demo needs react 18

[smol-honk]

Expected Behavior

We should be able to run the ssr-demo locally without needing to upgrade react or getting a fatal error about react.

Current Behavior

Got this error when trying to run ssr-demo locally:

Error: Next.js requires react >= 18.2.0 to be installed.
    at Object.<anonymous> (/Users/my.username/experiment-node-server/node_modules/next/dist/build/webpack-config.js:1842:11)

Possible Solution

I upgraded react to be v 18.2.0 and it ran correctly after that.

Steps to Reproduce

1. Clone the repo
2. Yarn install
3. cli command yarn start
4. get fatal error about react version

Environment

• JS Server SDK Version: main branch
• Installation Method: yarn
• Browser and Version: Chrome Version 120.0.6099.129