chore(deps-dev): bump @react-native/metro-config in /demo

Bumps [@react-native/metro-config](https://github.com/facebook/react-native/tree/HEAD/packages/metro-config) from 0.79.3 to 0.82.1.
- [Release notes](https://github.com/facebook/react-native/releases)
- [Changelog](https://github.com/facebook/react-native/blob/main/CHANGELOG-0.7x.md)
- [Commits](https://github.com/facebook/react-native/commits/v0.82.1/packages/metro-config)

---
updated-dependencies:
- dependency-name: "@react-native/metro-config"
  dependency-version: 0.82.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]