chore(deps): update commitlint monorepo to v15 (major) (#423)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package.json

@@ -36,8 +36,8 @@
     "vuetify-loader": "^1.7.2"
   },
   "devDependencies": {
-    "@commitlint/cli": "^8.3.5",
-    "@commitlint/config-conventional": "^8.3.4",
+    "@commitlint/cli": "^15.0.0",
+    "@commitlint/config-conventional": "^15.0.0",
     "@nuxt/types": "^2.15.6",
     "@nuxt/typescript-build": "^2.1.0",
     "@nuxt/typescript-runtime": "^2.1.0",