Update dependency mocha to ^8.2.1

Author: renovate-bot

package.json

@@ -71,7 +71,7 @@
         "eslint-plugin-vue-scoped-css": "^1.0.0",
         "eslint-plugin-yml": "^0.9.0",
         "eslint4b": "^7.19.0",
-        "mocha": "^8.0.0",
+        "mocha": "^8.2.1",
         "nyc": "^15.1.0",
         "pack": "^2.2.0",
         "prettier": "^2.0.5",