Update dependency eslint to v8

Author: renovate-bot

package.json

@@ -20,7 +20,7 @@
     "@types/node": "12.20.52",
     "@typescript-eslint/eslint-plugin": "2.34.0",
     "@typescript-eslint/parser": "2.34.0",
-    "eslint": "6.8.0",
+    "eslint": "8.15.0",
     "eslint-config-prettier": "8.5.0",
     "eslint-plugin-jest": "26.1.5",
     "eslint-plugin-prettier": "3.4.1",