chore(deps): update commitlint monorepo to v8

Author: renovate-bot

package.json

@@ -61,8 +61,8 @@
     "purgecss-webpack-plugin": "^1.4.0"
   },
   "devDependencies": {
-    "@commitlint/cli": "^7.5.2",
-    "@commitlint/config-conventional": "^7.5.0",
+    "@commitlint/cli": "^8.1.0",
+    "@commitlint/config-conventional": "^8.1.0",
     "@nuxtjs/eslint-config": "^0.0.1",
     "babel-eslint": "^10.0.1",
     "codecov": "^3.3.0",