[Snyk] Security upgrade jquery from 3.4.1 to 3.5.0

[vpetersson]

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

As this is a private repository, Snyk-bot does not have access. Therefore, this PR has been created automatically, but appears to have been created by a real user.

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	Issue	Breaking Change	Exploit Maturity
	Cross-site Scripting (XSS) SNYK-JS-JQUERY-565129	No	No Known Exploit

Check the changes in this PR to ensure they won't cause issues with your project.

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