[Snyk] Security upgrade mysql2 from 2.3.0 to 3.9.4

[alexy-merivot]

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

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	718/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 6.5	Prototype Poisoning SNYK-JS-MYSQL2-6591084	Yes	Proof of Concept
	718/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 6.5	Improper Input Validation SNYK-JS-MYSQL2-6591300	Yes	Proof of Concept

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

Commit messages

Package name: mysql2

The new version differs by 250 commits.

• cf3fa60 chore(master): release 3.9.4 (#2566)
• 4a964a3 fix(security): improve results object creation (#2574)
• 71115d8 ci: improve parser tests (#2573)
• 74abf9e fix(security): improve supportBigNumbers and bigNumberStrings sanitization (#2572)
• 8a818ce fix(docs): improve the contribution guidelines (#2552)
• 0f08c7c build(deps-dev): bump @ docusaurus/tsconfig in /website (#2563)
• 165c4d6 build(deps-dev): bump @ docusaurus/eslint-plugin in /website (#2564)
• 9b5ed7b build(deps): bump @ docusaurus/preset-classic in /website (#2562)
• 096db64 build(deps-dev): bump typescript from 5.4.3 to 5.4.4 (#2561)
• b91fd16 build(deps-dev): bump tsx from 4.7.1 to 4.7.2 in /website (#2557)
• 8e68d02 build(deps-dev): bump @ types/node from 20.12.3 to 20.12.4 (#2558)
• 0f2b89f build(deps): bump sass from 1.72.0 to 1.74.1 in /website (#2556)
• caa8598 build(deps-dev): bump @ types/node from 20.12.2 to 20.12.3 (#2555)
• 63f7789 chore(website): update dependencies manually (#2553)
• 63f1055 Separated each certificate into single array element (#2542)
• 19d378e build(deps-dev): bump @ types/node from 20.11.30 to 20.12.2 (#2544)
• a9c6c3e build(deps-dev): bump @ typescript-eslint/eslint-plugin in /website (#2535)
• e315b9e build(deps-dev): bump @ typescript-eslint/parser in /website (#2534)
• 1609b53 docs: remove RDS related issues (#2533)
• e82592e docs: fix change logs from v3.9.3 (#2532)
• f813a65 chore(master): release 3.9.3 (#2529)
• b603cae ci: drop Node.js 14 and 16 from matrix (#2531)
• bd30872 ci: fix test file name (#2530)
• 0d54b0c fix(cache): improve cache key serialization (#2424)

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🦉 Prototype Poisoning
🦉 Improper Input Validation