Update dependency eslint to v8

Author: renovate-bot

package.json

@@ -63,7 +63,7 @@
     "documentation": "^12.1.4",
     "enzyme": "^3.2.0",
     "enzyme-adapter-react-16": "^1.11.2",
-    "eslint": "^6.1.0",
+    "eslint": "^8.0.0",
     "husky": "^4.2.1",
     "isomorphic-fetch": "^2.2.1",
     "jest": "^25.1.0",