Bump react-devtools-core in /examples/test-old-bridge

Bumps [react-devtools-core](https://github.com/facebook/react/tree/HEAD/packages/react-devtools-core) from 4.28.0 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)

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

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