[Snyk] Security upgrade @twilio/flex-plugin-scripts from 6.0.3 to 6.4.0

[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):

• experimental-flex-dialpad/ui-src/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

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• Check the changes in this PR to ensure they won't cause issues with your project.
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• This PR was automatically created by Snyk using the credentials of a real user.

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Uncontrolled resource consumption 🦉 Prototype Pollution