[Snyk] Security upgrade react-scripts from 3.4.1 to 5.0.0

[twilio-product-security]

Snyk has created this PR to fix 4 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Uncontrolled resource consumption SNYK-JS-BRACES-6838727	169
	Inefficient Regular Expression Complexity SNYK-JS-MICROMATCH-6838728	124
	Prototype Pollution SNYK-JS-UNSETVALUE-2400660	115
	Regular Expression Denial of Service (ReDoS) SNYK-JS-GLOBPARENT-1016905	63

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• 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:

🦉 Uncontrolled resource consumption
🦉 Prototype Pollution