Bump mongodb from 3.6.4 to 3.6.5 in /aws-lambda-mongodb-atlas (#110)

Bumps [mongodb](https://github.com/mongodb/node-mongodb-native) from 3.6.4 to 3.6.5.
- [Release notes](https://github.com/mongodb/node-mongodb-native/releases)
- [Changelog](https://github.com/mongodb/node-mongodb-native/blob/3.6/CHANGES_3.0.0.md)
- [Commits](mongodb/node-mongodb-native@v3.6.4...v3.6.5)

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aws-lambda-mongodb-atlas/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "express": "^4.16.4",
     "faker": "^5.4.0",
-    "mongodb": "^3.1.13",
+    "mongodb": "^3.6.5",
     "serverless-http": "^2.2.0"
   }
 }