Update dependency eslint-plugin-react to v7.21.5

Author: renovate-bot

package.json

@@ -50,7 +50,7 @@
     "eslint-plugin-babel": "5.3.0",
     "eslint-plugin-import": "2.20.2",
     "eslint-plugin-jsx-a11y": "6.2.3",
-    "eslint-plugin-react": "7.19.0",
+    "eslint-plugin-react": "7.21.5",
     "eslint-plugin-react-hooks": "3.0.0",
     "husky": "4.2.3",
     "lint-staged": "10.1.1",