fix: upgrade mongodb from 3.5.8 to 3.5.9 (#6775)

Snyk has created this PR to upgrade mongodb from 3.5.8 to 3.5.9.

See this package in NPM:
https://www.npmjs.com/package/mongodb

See this project in Snyk:
https://app.snyk.io/org/acinader/project/8c1a9edb-c8f5-4dc1-b221-4d6030a323eb?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -45,7 +45,7 @@
     "lodash": "4.17.16",
     "lru-cache": "5.1.1",
     "mime": "2.4.6",
-    "mongodb": "3.5.8",
+    "mongodb": "3.5.9",
     "parse": "2.14.0",
     "pg-promise": "10.5.6",
     "pluralize": "^8.0.0",