Update react-test-renderer requirement

Updates the requirements on [react-test-renderer](https://github.com/facebook/react/tree/HEAD/packages/react-test-renderer) to permit the latest version.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v16.9.0/packages/react-test-renderer)

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

packages/generator/app/templates/package.json

@@ -64,7 +64,7 @@
     "karma-teamcity-reporter": "^1.1.0",
     "karma-webpack": "^4.0.2",
     "mocha": "^6.2.0",
-    "react-test-renderer": "^16.8.6",
+    "react-test-renderer": "^16.9.0",
     "sinon": "^7.4.1",
     "sinon-chai": "^3.3.0",
     "stylelint": "^10.1.0",