Update required node version and update dependencies

[mikachan]

This PR updates the required node version from 16.9.1 to 18, as I was seeing this error when trying to update dependencies:

It also updates all node dependencies.

Testing instructions

1. Run rm -rf node_modules to delete your current node_modules
2. If you use NVM, run nvm use to switch to node v18
3. Run npm ci to install the updated modules from the package-lock file in this PR
4. Try running npm start and npm run build - these commands should both run successfully

[jffng]

Tested well for me, I did have to run npm i before npm ci though.