[Snyk] Security upgrade @angular-devkit/core from 0.0.29 to 9.1.12

[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
	Prototype Pollution SNYK-JS-AJV-584908	Yes	No Known Exploit

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

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