[Snyk] Upgrade @types/mongodb from 3.1.19 to 3.6.20

[ardalanamini]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to upgrade @types/mongodb from 3.1.19 to 3.6.20.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 90 versions ahead of your current version.
• The recommended version was released a year ago, on 2021-07-07.

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