build(deps-dev): bump webpack from 5.25.0 to 5.26.0 in /addon

Bumps [webpack](https://github.com/webpack/webpack) from 5.25.0 to 5.26.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.25.0...v5.26.0)

Signed-off-by: dependabot[bot] <support@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": "^6.0.0",
-    "webpack": "^5.25.1",
+    "webpack": "^5.26.0",
     "webpack-cli": "^4.5.0"
   },
   "scripts": {