build(deps-dev): Bump eslint-plugin-no-unsanitized in /addon (#477)

Bumps [eslint-plugin-no-unsanitized](https://github.com/mozilla/eslint-plugin-no-unsanitized) from 3.0.2 to 3.1.0.
- [Release notes](https://github.com/mozilla/eslint-plugin-no-unsanitized/releases)
- [Commits](https://github.com/mozilla/eslint-plugin-no-unsanitized/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

addon/package-lock.json

@@ -10,7 +10,7 @@
   },
   "devDependencies": {
     "eslint-plugin-mozilla": "^0.9.0",
-    "eslint-plugin-no-unsanitized": "^3.0.2",
+    "eslint-plugin-no-unsanitized": "^3.1.0",
     "web-ext": "^4.1.0",
     "webpack": "^4.42.1",
     "webpack-cli": "^3.3.11"