[Snyk] Security upgrade react-scripts from 3.4.1 to 5.0.0

[DevProp]

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

Snyk changed the following file(s):

• fixtures/nesting/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Improper Verification of Cryptographic Signature SNYK-JS-ELLIPTIC-8187303	828

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