[Snyk] Security upgrade jest from 27.5.1 to 29.0.0

[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):

• packages/flex-plugin-scripts/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Missing Release of Resource after Effective Lifetime SNYK-JS-INFLIGHT-6095116	131

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