Update dependency eslint to v8.4.0

Author: renovate-bot

package.json

@@ -21,7 +21,7 @@
     "@types/jest": "27.0.2",
     "@types/node": "12.20.15",
     "@typescript-eslint/eslint-plugin": "5.4.0",
-    "eslint": "8.3.0",
+    "eslint": "8.4.0",
     "eslint-config-standard-with-typescript": "21.0.1",
     "eslint-plugin-import": "2.25.3",
     "eslint-plugin-jest": "25.3.0",