chore(deps): update dependency eslint-plugin-flowtype to v8

Author: pactflow-renovate-bot[bot]

package-lock.json

@@ -43,7 +43,7 @@
     "babel-eslint": "^10.0.3",
     "eslint": "^6.8.0",
     "eslint-config-react-app": "^5.1.0",
-    "eslint-plugin-flowtype": "^3.13.0",
+    "eslint-plugin-flowtype": "^8.0.0",
     "eslint-plugin-import": "^2.20.0",
     "eslint-plugin-jsx-a11y": "^6.2.3",
     "eslint-plugin-react": "^7.17.0",