[Snyk] Security upgrade @rails/webpacker from 4.2.2 to 5.2.2

[twilio-product-security]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Regular Expression Denial of Service (ReDoS) SNYK-JS-CROSSSPAWN-8303230	170

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• Check the changes in this PR to ensure they won't cause issues with your project.
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🦉 Regular Expression Denial of Service (ReDoS)