[Snyk] Security upgrade react-scripts from 3.4.1 to 3.4.3

[snyk-bot]

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:
  • voting-authority/frontend/package.json
  • voting-authority/frontend/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	706/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.7	Arbitrary Code Injection SNYK-JS-SERIALIZEJAVASCRIPT-570062	No	Proof of Concept
	586/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.3	Denial of Service (DoS) SNYK-JS-SOCKJS-575261	No	Proof of Concept
	601/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.6	Prototype Pollution SNYK-JS-YARGSPARSER-560381	No	Proof of Concept

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

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

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