[Snyk] Security upgrade mongoose from 6.0.13 to 6.4.6

[eiurur]

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

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

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • packages/backend/package.json
  • packages/backend/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	743/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7	Prototype Pollution SNYK-JS-MONGOOSE-2961688	No	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: mongoose

The new version differs by 250 commits.

• 5449ab9 chore: release 6.4.6
• b8c99cf Merge pull request #11892 from Automattic/netlify-functions-example
• 2751883 fix tests
• eced2c7 Merge branch 'master' into netlify-functions-example
• 92cb6fb Merge branch 'master' into vkarpov15/gh-12085
• 422f9da test(schema): add coverage for calling `plugin()` with options
• 2262a77 fix(document): avoid mutating original object passed to $set() when applying defaults to nested properties
• 2e6b064 made requested changes
• b70a0dc Merge pull request #12123 from LokeshKanumoori/patch-1
• 086bd9f fix(query): apply lean transform option to top-level document
• 1344214 Update migrating_to_6.md
• a45cfb6 fix(schema): disallow setting __proto__ when creating schema with dotted properties
• bc302f4 chore: release 6.4.5
• 44530a6 Merge pull request #12116 from Automattic/revert-12103-upgrade-mongo-driver
• 80b7d53 Revert "chore: upgrade mongodb driver to 4.8.0"
• 0156d5e style: fix lint
• 9524f89 fix(types): make `$addToSet` fields mutable to allow programatically constructing $addToSet
• 201071b fix(types): allow any value for AddFields
• 5301deb fix: cleanup and various updates
• 118c97a Merge branch 'master' into netlify-functions-example
• 1306d00 Merge pull request #12086 from hasezoey/modelJSDOCTouchup
• f95373d Merge pull request #12110 from skrtheboss/fix/is-atlas-check
• 1445c20 Merge pull request #12112 from pathei-kosmos/master
• 250b01b fix(types): avoid treating `| undefined` types as `any` in `Require_id` to better support `_id: String` with auto-typed schemas

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