Bump eslint-plugin-react from 7.21.3 to 7.21.4

Bumps [eslint-plugin-react](https://github.com/yannickcr/eslint-plugin-react) from 7.21.3 to 7.21.4.
- [Release notes](https://github.com/yannickcr/eslint-plugin-react/releases)
- [Changelog](https://github.com/yannickcr/eslint-plugin-react/blob/master/CHANGELOG.md)
- [Commits](jsx-eslint/eslint-plugin-react@v7.21.3...v7.21.4)

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

package.json

@@ -20,7 +20,7 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^3.1.4",
     "eslint-plugin-promise": "^4.2.1",
-    "eslint-plugin-react": "^7.21.3",
+    "eslint-plugin-react": "^7.21.4",
     "eslint-plugin-standard": "^4.0.1",
     "prettier": "^2.1.2"
   }