[Snyk] Security upgrade mongoose from 5.2.4 to 5.3.9

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `yarn` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • yarn.lock

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Deserialization of Untrusted Data SNYK-JS-BSON-561052	No	No Known Exploit

Check the changes in this PR to ensure they won't cause issues with your project.

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