fix(deps): update dependency diff to v9

Author: renovate[bot]

package-lock.json

@@ -12,7 +12,7 @@
   },
   "docker-image": "node-lts-latest",
   "dependencies": {
-    "diff": "8.0.4",
+    "diff": "9.0.0",
     "web-ext": "10.1.0"
   },
   "devDependencies": {