[Snyk] Upgrade react-scripts from 4.0.0 to 4.0.3

[snyk-bot]

Snyk has created this PR to upgrade react-scripts from 4.0.0 to 4.0.3.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 3 versions ahead of your current version.
• The recommended version was released 9 months ago, on 2021-02-22.

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