[Snyk] Security upgrade mongoose from 6.6.3 to 6.11.3

[tallosim]

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:
  • backend/package.json
  • backend/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	798/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 8.1	Prototype Pollution SNYK-JS-MONGOOSE-5777721	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.

• e9eb8ab chore: release 6.11.3
• 688da8f test: fix flakey tests, remove test for #9597 because it affects global state and fails intermittently on deno
• 4f264a8 test: fix tests re: #13317
• 9616af7 fix(schema): correctly handle uuids with populate()
• 305ce4f fix: avoid prototype pollution on init
• 35e59eb docs: link to migrating to 6 in 6.x docs
• a28933e chore: release 6.11.2
• 3a6b0dd chore: use deno v1.34 in test for MMS HTTP issues
• f7c6d3e Merge pull request #13476 from Automattic/vkarpov15/gh-13453
• 5552107 fix(cursor): allow find middleware to modify query cursor options
• 7a90868 Merge branch '6.x' of github.com:Automattic/mongoose into 6.x
• 23132db chore: release 6.11.1
• d96de21 Merge pull request #13384 from Automattic/vkarpov15/gh-13373
• 0ab335f docs: add note about SUPPRESS_JEST_WARNINGS to jest docs
• eb28aaf fix: quick error message improvement
• 9ea1a64 fix: add SUPPRESS_JEST_WARNINGS environment variable to silence jest warnings
• 76e6456 Merge pull request #13292 from hasezoey/modifyBulkWriteType6
• 2bbbb3c Merge pull request #13348 from Automattic/vkarpov15/gh-13340
• 523f6ce Merge pull request #13365 from hasezoey/denoFixCycle6x
• 48aed67 Revert "test: try removing mongodb memory server to try to fix deno tests"
• 5f587f7 chore(deno): change to start mocha fixtures before mocha
• 73ef135 chore: quick fix for versioned deploy
• d382b73 chore: more docs build fixes
• f0291e4 chore: improve 6.x docs build

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