chore(deps): update dependency mocha to v8 (#66)

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

Author: renovate[bot]

package.json

@@ -38,7 +38,7 @@
     "eslint-plugin-markdown": "^1.0.0",
     "eslint-plugin-vue-libs": "^3.0.0 || ^4.0.0",
     "lerna-changelog": "^1.0.0",
-    "mocha": "^7.0.0",
+    "mocha": "^8.0.0",
     "nyc": "^15.0.0",
     "opener": "^1.5.1",
     "rimraf": "^3.0.0",