Update eslint-plugin-react requirement to 7.7.0 (#9506)

Updates the requirements on [eslint-plugin-react](https://github.com/yannickcr/eslint-plugin-react) to permit the latest version.
- [Release notes](https://github.com/yannickcr/eslint-plugin-react/releases)
- [Changelog](https://github.com/yannickcr/eslint-plugin-react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yannickcr/eslint-plugin-react/commits/v7.7.0)

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

package.json

@@ -120,7 +120,7 @@
     "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-jsx-a11y": "^6.0.2",
     "eslint-plugin-markdown": "~1.0.0-beta.4",
-    "eslint-plugin-react": "7.5.1",
+    "eslint-plugin-react": "7.7.0",
     "eslint-tinker": "^0.4.0",
     "fetch-jsonp": "^1.0.3",
     "glob": "^7.1.1",