chore: upgrade to react 19

[Light2Dark]

📝 Summary

• https://react.dev/blog/2024/04/25/react-19-upgrade-guide
• removes @testing-library/react-hooks in favour of using @testing-library/react
• removed react-test-renderer, we don't use it anywhere + is deprecated

There is opportunity to cleanup a few things:

• don't need to use Context.Provider
• don't need to use forwardRef, can pass refs as props

🔍 Description of Changes

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

📜 Reviewers

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
marimo-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 10, 2025 2:21pm

[mscolnick]

There are some places to migrate:

const ReactCompilerConfig = {
-  target: "18",
+  target: "19",
};

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.13.16-dev69