[Snyk] Security upgrade react-scripts from 1.1.4 to 4.0.0

[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:

  • package.json
  • package-lock.json

• Adding or updating a Snyk policy (.snyk) file; this file is required in order to apply Snyk vulnerability patches. Find out more.

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	479/1000 Why? Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-JS-LOADERUTILS-3042992	Yes	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Prototype Pollution SNYK-JS-LOADERUTILS-3043105	Yes	No Known Exploit
	479/1000 Why? Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-JS-LOADERUTILS-3105943	Yes	No Known Exploit
	586/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-JS-POSTCSS-1255640	Yes	Proof of Concept
	601/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.6	Command Injection SNYK-JS-REACTDEVUTILS-1083268	Yes	Proof of Concept

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

With a Snyk patch:

Severity	Priority Score (*)	Issue	Exploit Maturity
	731/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 8.2	Prototype Pollution SNYK-JS-LODASH-567746	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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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Regular Expression Denial of Service (ReDoS) 🦉 Prototype Pollution