[Snyk] Security upgrade react-scripts from 3.2.0 to 5.0.0

[twilio-product-security]

Snyk has created this PR to fix 2 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
	Missing Release of Resource after Effective Lifetime SNYK-JS-INFLIGHT-6095116	141
	Prototype Pollution SNYK-JS-TOUGHCOOKIE-5672873	111

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[!IMPORTANT]

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
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🦉 Prototype Pollution