chore(deps): update dependency eslint to v8

Author: renovate[bot]

package.json

@@ -17,7 +17,7 @@
     "@vue/cli-plugin-eslint": "3.12.1",
     "@vue/cli-service": "3.12.1",
     "babel-eslint": "^10.0.1",
-    "eslint": "^5.8.0",
+    "eslint": "^8.0.0",
     "eslint-plugin-vue": "^5.0.0",
     "vue-template-compiler": "^2.5.21"
   },