build(deps-dev): bump react-docgen from 5.4.3 to 7.0.3

Bumps [react-docgen](https://github.com/reactjs/react-docgen/tree/HEAD/packages/react-docgen) from 5.4.3 to 7.0.3.
- [Release notes](https://github.com/reactjs/react-docgen/releases)
- [Changelog](https://github.com/reactjs/react-docgen/blob/main/packages/react-docgen/CHANGELOG.md)
- [Commits](https://github.com/reactjs/react-docgen/commits/react-docgen@7.0.3/packages/react-docgen)

---
updated-dependencies:
- dependency-name: react-docgen
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -76,7 +76,7 @@
     "node-dir": "0.1.17",
     "prettier": "^2.0.4",
     "react": "16.8.3",
-    "react-docgen": "^5.0.0-beta.1",
+    "react-docgen": "^7.0.3",
     "react-native": "0.59.10",
     "react-test-renderer": "16.8.3",
     "typescript": "^4.4.3"