build(deps): bump react-devtools-core and react-native in /example (#259)

Bumps [react-devtools-core](https://github.com/facebook/react/tree/HEAD/packages/react-devtools-core) to 4.28.4 and updates ancestor dependency [react-native](https://github.com/facebook/react-native). These dependencies need to be updated together.


Updates `react-devtools-core` from 4.24.0 to 4.28.4
- [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/HEAD/packages/react-devtools-core)

Updates `react-native` from 0.70.2 to 0.72.6
- [Release notes](https://github.com/facebook/react-native/releases)
- [Changelog](https://github.com/facebook/react-native/blob/main/CHANGELOG.md)
- [Commits](react/react-native@v0.70.2...v0.72.6)

---
updated-dependencies:
- dependency-name: react-devtools-core
  dependency-type: indirect
- dependency-name: react-native
  dependency-type: direct:production
...

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Author: dependabot[bot]