Fix warning on ReactDOM.render by using React 18 client API.

[radglob]

Updated ConfirmationDialog to use React 18's createRoot API instead of ReactDOM.render.

Closes #2990.

We may want to look into using the Portal API to avoid rendering a separate React app in the future.

Screenshots

Please provide before/after screenshots for any visual changes

Merge checklist

• Added/updated tests
• Added/updated documentation
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

Take a look at the What we look for in reviews section of the contributing guidelines for more information on how we review PRs.

[changeset-bot]

🦋 Changeset detected

Latest commit: f5f5cca

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	101.68 KB (+0.02% 🔺)
dist/browser.umd.js	102.25 KB (+0.02% 🔺)

[joshblack]

@radglob could you target the next-major branch for this when you get the chance? Sadly the react-dom/client stuff won't work with v17 so we have to have a hard change to v18 for it 😞

[radglob]

@radglob could you target the next-major branch for this when you get the chance? Sadly the react-dom/client stuff won't work with v17 so we have to have a hard change to v18 for it 😞

Ah, yeah, sure thing.

[radglob]

Need to target next-major, will do so in a new branch.