Bump metro-config in /react-native/react-native-flipper

Bumps [metro-config](https://github.com/facebook/metro) from 0.76.4 to 0.76.7.
- [Release notes](https://github.com/facebook/metro/releases)
- [Changelog](https://github.com/facebook/metro/blob/main/CHANGELOG.md)
- [Commits](facebook/metro@v0.76.4...v0.76.7)

---
updated-dependencies:
- dependency-name: metro-config
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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