build(deps-dev): bump web-ext from 7.7.0 to 7.8.0 in /addon (#2102)

Bumps [web-ext](https://github.com/mozilla/web-ext) from 7.7.0 to 7.8.0.
- [Release notes](https://github.com/mozilla/web-ext/releases)
- [Commits](mozilla/web-ext@7.7.0...7.8.0)

---
updated-dependencies:
- dependency-name: web-ext
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

addon/package.json

@@ -11,7 +11,7 @@
   "devDependencies": {
     "eslint-plugin-mozilla": "^2.11.1",
     "eslint-plugin-no-unsanitized": "^3.1.5",
-    "web-ext": "^7.7.0",
+    "web-ext": "^7.8.0",
     "webpack": "^5.88.2",
     "webpack-cli": "^5.1.4"
   },