[Snyk] Security upgrade react-scripts from 2.1.1 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.

Changes included in this PR

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

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Cross-site Scripting (XSS) SNYK-JS-SERIALIZEJAVASCRIPT-536840	Yes	No Known Exploit
	Arbitrary Code Injection SNYK-JS-SERIALIZEJAVASCRIPT-570062	Yes	Proof of Concept
	Regular Expression Denial of Service (ReDoS) npm:braces:20180219	Yes	Proof of Concept

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

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