chore(deps-dev): bump react and @types/react in /flipt-client-react

Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) and [@types/react](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react). These dependencies needed to be updated together.

Updates `react` from 18.3.1 to 19.2.0
- [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/v19.2.0/packages/react)

Updates `@types/react` from 18.3.20 to 19.2.2
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react)

---
updated-dependencies:
- dependency-name: react
  dependency-version: 19.2.0
  dependency-type: direct:development
  update-type: version-update:semver-major
- dependency-name: "@types/react"
  dependency-version: 19.2.2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

flipt-client-react/package-lock.json

@@ -41,7 +41,7 @@
     "@rollup/plugin-typescript": "^12.1.0",
     "@testing-library/react": "^16.0.1",
     "@types/jest": "^30.0.0",
-    "@types/react": "^18.0.0",
+    "@types/react": "^19.2.2",
     "@types/use-sync-external-store": "^1.5.0",
     "@typescript-eslint/eslint-plugin": "^8.11.0",
     "@typescript-eslint/parser": "^8.11.0",
@@ -55,7 +55,7 @@
     "jest-environment-jsdom": "^29.7.0",
     "jest-environment-jsdom-global": "^4.0.0",
     "prettier": "^3.3.3",
-    "react": "^18.0.0",
+    "react": "^19.2.0",
     "react-dom": "^18.0.0",
     "rimraf": "^6.0.1",
     "rollup": "^4.22.2",