[Snyk] Security upgrade mongoose from 5.13.4 to 6.0.4

[snyk-bot]

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
	673/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 5.6	Prototype Pollution SNYK-JS-MPATH-1577289	Yes	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.

• 8d37fe5 chore: release 6.0.4
• 0e79c5c Merge pull request #10633 from AbdelrahmanHafez/prefer-async-await
• 09dae52 docs: remove useNewUrlParser, useUnifiedTopology, some other legacy options from docs
• d278258 Merge pull request #10645 from theonlydaleking/patch-1
• bb7c021 docs(defaults): clarify that `setDefaultsOnInsert` is `true` by default in 6.x
• 36d23ce fix(schema): handle maps of maps
• d21d2b1 test(schema): repro #10644
• 57540aa fix(index.d.ts): allow using `type: [documentDefinition]` when defining a doc array in a schema
• 1a1a2f2 test: repro #10605
• e94d603 fix: avoid setting defaults on insert on a path whose subpath is referenced in the update
• e1d4aa4 fix(index.d.ts): simplify UpdateQuery to avoid "excessively deep and possibly infinite" errors with `extends Document` and `any`
• 3ee32b1 fix: upgrade mpath -> 0.8.4 re: Security Fix for Prototype Pollution mongoosejs/mpath#13
• 8fc256c fix(schema): throw error if `versionKey` is not a string
• 3401881 chore: update opencollective sponsors
• 0305c3b update TS docs to reflect connect Opts
• 463f2d8 chore: release 6.0.3
• 953131d Merge pull request #10635 from AbdelrahmanHafez/patch-11
• c4b0e86 get rid of co
• d1ffe7c refactor more tests to async/await
• 48badcd refactor more tests to async/await
• 3089342 refactor more tests to async/await
• 72cdab0 refactor more tests to async/await
• ab07251 use await delay instead of yield callback
• 720f0cc refactor more tests to async/await

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