build(deps): bump purgecss deps versions

bump commander from 6 to 8

Author: Ffloriel

package-lock.json

@@ -14,6 +14,7 @@
     "vue-cli-plugin-purgecss"
   ],
   "devDependencies": {
+    "@rollup/plugin-json": "^4.1.0",
     "@types/jest": "^26.0.23",
     "@types/node": "^16.0.0",
     "@typescript-eslint/eslint-plugin": "^4.28.2",