[Snyk] Security upgrade react-scripts from 3.2.0 to 4.0.0

[twilio-product-security]

This PR was automatically created by Snyk using the credentials of a real user.


Snyk has created this PR to fix 3 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
	Inefficient Regular Expression Complexity SNYK-JS-MICROMATCH-6838728	124
	Prototype Pollution SNYK-JS-TOUGHCOOKIE-5672873	118
	Server-side Request Forgery (SSRF) SNYK-JS-REQUEST-3361831	111

---

[!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.
• This PR was automatically created by Snyk using the credentials of a real user.

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

For more information: 🧐 View latest project report 📜 Customise PR templates 🛠 Adjust project settings 📚 Read about Snyk's upgrade logic

---

Learn how to fix vulnerabilities with free interactive lessons:

🦉 Inefficient Regular Expression Complexity 🦉 Server-side Request Forgery (SSRF) 🦉 Prototype Pollution