chore(deps): update dependency mongoose to v9

Author: renovate[bot]

package-lock.json

@@ -20,7 +20,7 @@
     "@sentry/node": "10.11.0",
     "discord.js": "14.22.1",
     "dotenv": "17.2.2",
-    "mongoose": "8.18.1"
+    "mongoose": "9.1.1"
   },
   "devDependencies": {
     "@types/node": "24.3.1",