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Fix MongoDB Node.js Driver v3.0+ Compatibility Issue

Fix MongoDB Node.js Driver v3.0+ Compatibility Issue: a task in Terminal-Lego-15k (Harbor dataset). This is because the MongoClient.connect() callback signature changed in v3.0. The callback now receives a client object instead of a db object directly.

The task

This is because the `MongoClient.connect()` callback signature changed in v3.0. The callback now receives a `client` object instead of a `db` object directly.

Part of PrimeIntellect/Terminal-Lego-15k.