core: use mongodb@6

packages/hydrooj/package.json

@@ -41,9 +41,9 @@
         "lru-cache": "^10.4.3",
         "mime-types": "^2.1.35",
         "moment-timezone": "^0.5.47",
-        "mongodb": "^5.9.2",
+        "mongodb": "^6.15.0",
         "mongodb-uri": "^0.9.7",
-        "nanoid": "^5.1.4",
+        "nanoid": "^5.1.5",
         "nodemailer": "^6.10.0",
         "notp": "^2.0.3",
         "p-queue": "^8.1.0",