chore(deps): bump react-native from 0.80.1 to 0.81.4 in /demo

Bumps [react-native](https://github.com/facebook/react-native/tree/HEAD/packages/react-native) from 0.80.1 to 0.81.4.
- [Release notes](https://github.com/facebook/react-native/releases)
- [Changelog](https://github.com/facebook/react-native/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/react-native/commits/v0.81.4/packages/react-native)

---
updated-dependencies:
- dependency-name: react-native
  dependency-version: 0.81.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]