Update React peer deps to v18

[anomiex]

Proposed changes:

When #28710 updated the React dependencies, our packages' peer dependencies were overlooked. Update them too.

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

None, but see #28710

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• 🤷

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[github-actions]

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[zinigor]

This looks OK, but we probably have to rebase or re-try this one.

[zinigor]

I've manually bumped versions to match with trunk.

[anomiex]

Had to fix a version number, so it needs re-approval