chore(deps): update commitlint monorepo to v18

Author: renovate[bot]

package.json

@@ -37,8 +37,8 @@
     "vuetify-loader": "^1.7.3"
   },
   "devDependencies": {
-    "@commitlint/cli": "^15.0.0",
-    "@commitlint/config-conventional": "^15.0.0",
+    "@commitlint/cli": "^18.0.0",
+    "@commitlint/config-conventional": "^18.0.0",
     "@nuxt/types": "^2.15.8",
     "@nuxt/typescript-build": "^2.1.0",
     "@nuxt/typescript-runtime": "^2.1.0",