[Snyk] Security upgrade ngx-md from 3.1.0 to 4.0.0

[snyk-bot]

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

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • frontend/package.json
  • frontend/yarn.lock

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-MARKED-174116	Yes	No Known Exploit
	Regular Expression Denial of Service (ReDoS) SNYK-JS-MARKED-451540	Yes	No Known Exploit

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

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