[Snyk] Security upgrade mongoose from 6.12.0 to 6.13.6

[PratyushSingh07]

Snyk has created this PR to fix 1 vulnerabilities in the yarn dependencies of this project.

Snyk changed the following file(s):

• Backend/package.json
• Backend/yarn.lock

Note for zero-installs users

If you are using the Yarn feature zero-installs that was introduced in Yarn V2, note that this PR does not update the .yarn/cache/ directory meaning this code cannot be pulled and immediately developed on as one would expect for a zero-install project - you will need to run yarn to update the contents of the ./yarn/cache directory.
If you are not using zero-install you can ignore this as your flow should likely be unchanged.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Improper Neutralization of Special Elements in Data Query Logic SNYK-JS-MONGOOSE-8623536	649

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Improper Neutralization of Special Elements in Data Query Logic