[Snyk] Security upgrade ngx-markdown from 8.1.0 to 9.1.0

[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:
  • Angular/package.json
  • Angular/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS ) SNYK-JS-MARKED-584281	Yes	No Known Exploit

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

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