Bump react from 18.2.0 to 19.0.0 in /_roastery/jsx-app

Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) from 18.2.0 to 19.0.0.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v19.0.0/packages/react)

---
updated-dependencies:
- dependency-name: react
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

_roastery/jsx-app/package.json

@@ -9,7 +9,7 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "react": "^18",
+    "react": "^19",
     "react-dom": "^18",
     "next": "14.0.4"
   },