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

Bumps [metro-config](https://github.com/facebook/metro) from 0.76.4 to 0.78.1.
- [Release notes](https://github.com/facebook/metro/releases)
- [Changelog](https://github.com/facebook/metro/blob/main/CHANGELOG.md)
- [Commits](facebook/metro@v0.76.4...v0.78.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

react-native/react-native-flipper/package.json

@@ -28,7 +28,7 @@
     "react-native": ">0.62.0"
   },
   "devDependencies": {
-    "metro-config": "^0.76.0",
+    "metro-config": "^0.78.1",
     "react": "^17.0.2",
     "react-native": "^0.68.2",
     "react-native-windows": "0.68.2"