fix: playground was not using react-dom@18

[heath-freenome]

Reasons for making this change

fixes #3631, #3625, #3620

• The playground was on React 18 except for the react-dom, until now

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests. I've run npm run test:update to update snapshots, if needed.
  • I've updated docs if needed
  • I've updated the changelog with a description of the PR
• I'm adding a new feature
  • I've updated the playground with an example use of the feature