Merge pull request #401 from mozilla/dependabot/npm_and_yarn/samples/web-extension/javascript/mocha-9.0.0

Bump mocha from 8.4.0 to 9.0.0 in /samples/web-extension/javascript

Author: Beatriz Rizental

samples/web-extension/javascript/package-lock.json

@@ -16,7 +16,7 @@
     "webextension-polyfill": "^0.8.0"
   },
   "devDependencies": {
-    "mocha": "^8.4.0",
+    "mocha": "^9.0.0",
     "typescript": "^4.3.2",
     "webpack": "^5.38.1",
     "webpack-cli": "^4.7.2"