DeprecationWarning: Listening to events on the Db class has been deprecated and will be removed in the next major version

I got some deprecation warning

OS : macOS 11.2 Big Sur
Monk : Latest 7.3.3
Mongodb : Latest 3.6.4

```
(node:58674) DeprecationWarning: Listening to events on the Db class has been deprecated and will be removed in the next major version.
at /Users/forte/Workspace/freejs/node_modules/monk/lib/manager.js:150:18
at Array.forEach ()
at Manager. (/Users/forte/Workspace/freejs/node_modules/monk/lib/manager.js:149:95)
at /Users/forte/Workspace/freejs/node_modules/mongodb/lib/utils.js:693:5
at /Users/forte/Workspace/freejs/node_modules/mongodb/lib/mongo_client.js:227:7
at connectCallback (/Users/forte/Workspace/freejs/node_modules/mongodb/lib/operations/connect.js:366:5)
at /Users/forte/Workspace/freejs/node_modules/mongodb/lib/operations/connect.js:602:5
at Object.connectHandler [as callback] (/Users/forte/Workspace/freejs/node_modules/mongodb/lib/core/sdam/topology.js:297:43)
at processWaitQueue (/Users/forte/Workspace/freejs/node_modules/mongodb/lib/core/sdam/topology.js:1048:21)
at NativeTopology.serverUpdateHandler (/Users/forte/Workspace/freejs/node_modules/mongodb/lib/core/sdam/topology.js:567:7)
at Server.emit (events.js:315:20)
at Server.EventEmitter.emit (domain.js:467:12)
at Monitor. (/Users/forte/Workspace/freejs/node_modules/mongodb/lib/core/sdam/server.js:151:12)
at Monitor.emit (events.js:327:22)
at Monitor.EventEmitter.emit (domain.js:467:12)
at /Users/forte/Workspace/freejs/node_modules/mongodb/lib/core/sdam/monitor.js:272:13
```

Start by inspecting lib/manager.js around lines 149-150, where the stack trace shows Monk listening for events on the Db class. Reproduce the warning with Monk 7.3.3 and MongoDB 3.6.4, then verify that the deprecation warning no longer appears while the relevant event behavior still works.

Written by the indexing model from the issue text.