Bump react from 17.0.2 to 19.2.7 in /packages/app

Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) from 17.0.2 to 19.2.7.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/react/react/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v19.2.7/packages/react)

---
updated-dependencies:
- dependency-name: react
  dependency-version: 19.2.7
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/app/package.json

@@ -21,7 +21,7 @@
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",
     "history": "^5.0.0",
-    "react": "^17.0.2",
+    "react": "^19.2.7",
     "react-dom": "^17.0.2",
     "react-router": "^6.3.0",
     "react-router-dom": "^6.3.0",