build(deps-dev): bump webpack from 5.7.0 to 5.9.0 in /addon (#685)

Bumps [webpack](https://github.com/webpack/webpack) from 5.7.0 to 5.9.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.7.0...v5.9.0)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

addon/package-lock.json

@@ -12,7 +12,7 @@
     "eslint-plugin-mozilla": "^0.9.0",
     "eslint-plugin-no-unsanitized": "^3.1.4",
     "web-ext": "^5.4.0",
-    "webpack": "^5.7.0",
+    "webpack": "^5.9.0",
     "webpack-cli": "^4.2.0"
   },
   "scripts": {